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Magento 2 Cookbook
Magento 2 Cookbook
Ray Bogman
¥80.65
Over 50 practical recipes that will help you realize the full potential of Magento in order to build a professional online store About This Book Take advantage of the latest features in Magento 2 to set up an e-commerce store that fits your business needs Packed with several advanced recipes, not just to manage your online store, but to extend and design it as well Written in a cookbook style, you can pick and choose your recipe to carry out your day- to- day Magento store tasks Who This Book Is For The book is for existing Magento users who want to gain further expertise and insights into managing, designing, and extending their online store in Magento to fit their business needs. Working knowledge of Magento and basic familiarity with programming is expected. What You Will Learn Set up a Magento 2 project on Apache or Nginx. Transfer your Magento 1 database to Magento 2 using the Magento 2 system tools. Boost the performance of Magento 2 by enabling different types of caching. Build a Magento 2 multi-store by creating a root catalog, subdirectories, and products. Create and manage pages, blocks, and front-end apps. Manage your Magento store by setting up the correct TAX rules. Design custom themes within the Magento 2 framework. Create basic and advanced extensions using Magento 2. In Detail Magento 2 is an open source e-commerce platform that has all the functionality to function from small to large online stores. It is preferred by developers and merchants due to its new architecture, which makes it possible to extend the functionalities with plugins, a lot of which are now created by the community. This merchant and developer guide is packed with recipes that cover all aspects of Magento 2. The recipes start with simple how-to’s then delve into more advanced topics as the book progresses. We start with the basics of setting up a Magento 2 project on Apache or Nginx. Next, you will learn about basics including system tools and caching to get your Magento 2 system ready for the real work. We move on to simple tasks such as managing your store and catalog configuration. When you are familiar with this, we cover more complex features such as module and extension development. Then we will jump to the final part: advanced Magento 2 extensions. By the end of this book, you’ll be competent with all the development phases of Magento 2 and its most common elements. Style and approach Step by step guide for real world tasks for Magento users to gain a more advanced insight on managing, extending and designing their e-commerce store to fit their business needs.
Advanced Penetration Testing for Highly-Secured Environments - Second Edition
Advanced Penetration Testing for Highly-Secured Environments - Second Edition
Lee Allen
¥107.90
Employ the most advanced pentesting techniques and tools to build highly-secured systems and environments About This Book Learn how to build your own pentesting lab environment to practice advanced techniques Customize your own *s, and learn methods to exploit 32-bit and 64-bit programs Explore a vast variety of stealth techniques to bypass a number of protections when penetration testing Who This Book Is For This book is for anyone who wants to improve their skills in penetration testing. As it follows a step-by-step approach, anyone from a novice to an experienced security tester can learn effective techniques to deal with highly secured environments. Whether you are brand new or a seasoned expert, this book will provide you with the skills you need to successfully create, customize, and plan an advanced penetration test. What You Will Learn A step-by-step methodology to identify and penetrate secured environments Get to know the process to test network services across enterprise architecture when defences are in place Grasp different web application testing methods and how to identify web application protections that are deployed Understand a variety of concepts to exploit software Gain proven post-exploitation techniques to exfiltrate data from the target Get to grips with various stealth techniques to remain undetected and defeat the latest defences Be the first to find out the latest methods to bypass firewalls Follow proven approaches to record and save the data from tests for analysis In Detail The defences continue to improve and become more and more common, but this book will provide you with a number or proven techniques to defeat the latest defences on the networks. The methods and techniques contained will provide you with a powerful arsenal of best practices to increase your penetration testing successes. The processes and methodology will provide you techniques that will enable you to be successful, and the step by step instructions of information gathering and intelligence will allow you to gather the required information on the targets you are testing. The exploitation and post-exploitation sections will supply you with the tools you would need to go as far as the scope of work will allow you. The challenges at the end of each chapter are designed to challenge you and provide real-world situations that will hone and perfect your penetration testing skills. You will start with a review of several well respected penetration testing methodologies, and following this you will learn a step-by-step methodology of professional security testing, including stealth, methods of evasion, and obfuscation to perform your tests and not be detected! The final challenge will allow you to create your own complex layered architecture with defences and protections in place, and provide the ultimate testing range for you to practice the methods shown throughout the book. The challenge is as close to an actual penetration test assignment as you can get! Style and approach The book follows the standard penetration testing stages from start to finish with step-by-step examples. The book thoroughly covers penetration test expectations, proper scoping and planning, as well as enumeration and foot printing
R Machine Learning By Example
R Machine Learning By Example
Raghav Bali
¥90.46
Understand the fundamentals of machine learning with R and build your own dynamic algorithms to tackle complicated real-world problems successfully About This Book Get to grips with the concepts of machine learning through exciting real-world examples Visualize and solve complex problems by using power-packed R constructs and its robust packages for machine learning Learn to build your own machine learning system with this example-based practical guide Who This Book Is For If you are interested in mining useful information from data using state-of-the-art techniques to make data-driven decisions, this is a go-to guide for you. No prior experience with data science is required, although basic knowledge of R is highly desirable. Prior knowledge in machine learning would be helpful but is not necessary. What You Will Learn Utilize the power of R to handle data extraction, manipulation, and exploration techniques Use R to visualize data spread across multiple dimensions and extract useful features Explore the underlying mathematical and logical concepts that drive machine learning algorithms Dive deep into the world of analytics to predict situations correctly Implement R machine learning algorithms from scratch and be amazed to see the algorithms in action Write reusable code and build complete machine learning systems from the ground up Solve interesting real-world problems using machine learning and R as the journey unfolds Harness the power of robust and optimized R packages to work on projects that solve real-world problems in machine learning and data science In Detail Data science and machine learning are some of the top buzzwords in the technical world today. From retail stores to Fortune 500 companies, everyone is working hard to making machine learning give them data-driven insights to grow their business. With powerful data manipulation features, machine learning packages, and an active developer community, R empowers users to build sophisticated machine learning systems to solve real-world data problems. This book takes you on a data-driven journey that starts with the very basics of R and machine learning and gradually builds upon the concepts to work on projects that tackle real-world problems. You’ll begin by getting an understanding of the core concepts and definitions required to appreciate machine learning algorithms and concepts. Building upon the basics, you will then work on three different projects to apply the concepts of machine learning, following current trends and cover major algorithms as well as popular R packages in detail. These projects have been neatly divided into six different chapters covering the worlds of e-commerce, finance, and social-media, which are at the very core of this data-driven revolution. Each of the projects will help you to understand, explore, visualize, and derive insights depending upon the domain and algorithms. Through this book, you will learn to apply the concepts of machine learning to deal with data-related problems and solve them using the powerful yet simple language, R. Style and approach The book is an enticing journey that starts from the very basics to gradually pick up pace as the story unfolds. Each concept is first defined in the larger context of things succinctly, followed by a detailed explanation of their application. Each topic is explained with the help of a project that solves a real real-world problem involving hands-on work thus giving you a deep insight into the world of machine learning.
Mastering Cross-Platform Development with Xamarin
Mastering Cross-Platform Development with Xamarin
Can Bilgin
¥80.65
Master the skills required to steer cross-platform applications from drawing board to app store(s) using Xamarin About This Book Develop your Xamarin development skills with this comprehensive guide on various patterns and features so you can create elegant and high-quality applications Create adaptive user interfaces on separate platforms without compromising the user experience and platform identity Implement application lifecycle management concepts to manage and finalize cross-platform projects and efficiently collaborate with others Who This Book Is For This book is ideal for those who want to take their entry–level Xamarin mobile development skills to the next level to become the go-to person within their organization. To fully understand the patterns and concepts described, you should possess a reasonable level of knowledge about the core elements of Xamarin and cross-platform application development with it. What You Will Learn Configure your environment for cross-platform projects with Xamarin Gain memory management skills to avoid memory leaks and premature code cycles while decreasing the memory print of your applications Employ asynchronous and parallel patterns to execute non-interactive and non-blocking processes Create and use SQLite databases for offline scenarios Integrate network resources with cross-platform applications Design and implement eye-catching and reusable UI components without compromising nativity in mobile applications Manage the application lifecycle of cross-platform development projects Distribute Xamarin applications through public or private channels In Detail The main goal of this book is to equip you with the required know-how to successfully analyze, develop, and manage Xamarin cross-platform projects using the most efficient, robust, and scalable implementation patterns. This book starts with general topics such as memory management, asynchronous programming, local storage, and networking, and later moves onto platform-specific features. During this transition, you will learn about key tools to leverage the patterns described, as well as advanced implementation strategies and features. The book also presents User Interface design and implementation concepts on Android and iOS platforms from a Xamarin and cross-platform perspective, with the goal to create a consistent but native UI experience. Finally, we show you the toolset for application lifecycle management to help you prepare the development pipeline to manage and see cross-platform projects through to public or private release. Style and approach This is a comprehensive guide on various Xamarin features and patterns. Each topic is explained and demonstrated with code samples, which are revised in each section in an iterative manner and analyzed with available diagnostic tools to demonstrate the benefits of different patterns.
Mastering Wireshark
Mastering Wireshark
Charit Mishra
¥90.46
Analyze data network like a professional by mastering Wireshark - From 0 to 1337 About This Book Master Wireshark and train it as your network sniffer Impress your peers and get yourself pronounced as a network doctor Understand Wireshark and its numerous features with the aid of this fast-paced book packed with numerous screenshots, and become a pro at resolving network anomalies Who This Book Is For Are you curious to know what’s going on in a networkDo you get frustrated when you are unable to detect the cause of problems in your networksThis is where the book comes into play. Mastering Wireshark is for developers or network enthusiasts who are interested in understanding the internal workings of networks and have prior knowledge of using Wireshark, but are not aware about all of its functionalities. What You Will Learn Install Wireshark and understand its GUI and all the functionalities of it Create and use different filters Analyze different layers of network protocols and know the amount of packets that flow through the network Decrypt encrypted wireless traffic Use Wireshark as a diagnostic tool and also for network security analysis to keep track of malware Troubleshoot all the network anomalies with help of Wireshark Resolve latencies and bottleneck issues in the network In Detail Wireshark is a popular and powerful tool used to analyze the amount of bits and bytes that are flowing through a network. Wireshark deals with the second to seventh layer of network protocols, and the analysis made is presented in a human readable form. Mastering Wireshark will help you raise your knowledge to an expert level. At the start of the book, you will be taught how to install Wireshark, and will be introduced to its interface so you understand all its functionalities. Moving forward, you will discover different ways to create and use capture and display filters. Halfway through the book, you’ll be mastering the features of Wireshark, analyzing different layers of the network protocol, looking for any anomalies. As you reach to the end of the book, you will be taught how to use Wireshark for network security analysis and configure it for troubleshooting purposes. Style and approach Every chapter in this book is explained to you in an easy way accompanied by real-life examples and screenshots of the interface, making it easy for you to become an expert at using Wireshark.
OpenStack Trove Essentials
OpenStack Trove Essentials
Alok Shrivastwa
¥63.21
Build your own cloud based Database as a Service using OpenStack Trove About This Book Familiarize yourself with the concept of Database as a Service and make your existing system scalable and efficient with OpenStack Trove Minimize the administrative tasks and complexities of managing your cloud infrastructure This is a fast-paced guide to datastore management on the OpenStack platform using OpenStack Trove Who This Book Is For If you are a DBA / system administrator / architect, or a student who wants to build a Database as a Service based on OpenStack, this book is for you. You should have a basic knowledge of OpenStack components, RDBMS/NoSQL, IaaS, and cloud computing. What You Will Learn Get to grips with the basics of OpenStack and the prerequisites to install Trove Understand the expectations of DBaaS and how Trove can help you achieve them Set up a basic installation of DevStack (Development Stack) in a virtual box Install Trove and utilize its configuration groups to manage and tune databases Use Image builder to create guest images for Trove Utilize Trove to provision your first database instance Back up and restore your databases with the help of Trove In Detail OpenStack has become an extremely popular solution to build public and private clouds with. Database as a Service (DBaaS) enables the delivery of more agile database services at lower costs. Some other benefits of DBaaS are secure database deployments and compliance to standards and best practices. Trove is a DBaaS built on OpenStack and is becoming more popular by the day. Since Trove is one of the most recent projects of OpenStack, DBAs and system administrators can find it difficult to set up and run a DBaaS using OpenStack Trove. This book helps DBAs make that step. We start by introducing you to the concepts of DBaaS and how is it implemented using OpenStack Trove. Following this, we look at implementing OpenStack and deploying Trove. Moving on, you will learn to create guest images to be used with Trove. We then look at how to provision databases in self-service mode, and how to perform administration tasks such as backup and recovery, and fine-tuning databases. At the end of the book, we will examine some advanced features of Trove such as replication. Style and approach This fast-paced, step-by-step guide introduces you to DBaaS, OpenStack Trove, and its components, leading you through building your own Cloud-based DBaaS. Using the DevStack deployment method, you will spend less time on installing OpenStack so you can devote more time to learning how to provision and manage databases in a DBaaS environment.
Flask By Example
Flask By Example
Gareth Dwyer
¥63.21
Unleash the full potential of the Flask web framework by creating simple yet powerful web applications About This Book The most up-to-date book on Flask on the market Create your own world-class applications and master the art of Flask by unravelling its enigma through this journey This step-by-step tutorial is packed with examples on blending different technologies with Flask to get you up and running Who This Book Is For Have you looked at PHP and hated the clunky bloated syntaxOr looked at .Net and wished it was more open and flexibleMaybe you’ve tried your hand at GUI libraries in Python and found them hard to useIf your answer to any one of these questions is a yes, then this is just the book for you. It is also intended for people who know the basics of Python and want to learn how to use it to build powerful solutions with a web front-end. What You Will Learn Build three web applications from the ground up using the powerful Python micro framework, Flask. Dynamically display data to your viewers, based on their requests Store user and static data in SQL and NoSQL databases and use this data to power your web applications Create a good user experience by combining HTML, CSS, and JavaScript Harness the convenience of freely available APIs, including OpenWeatherMap, Open Exchange Rates, and bitly Extend your applications to build advanced functionality, such as a user account control system using Flask-Login Learn about web application security and defend against common attacks, such as SQL injection and XSS In Detail This book will take you on a journey from learning about web development using Flask to building fully functional web applications. In the first major project, we develop a dynamic Headlines application that displays the latest news headlines along with up-to-date currency and weather information. In project two, we build a Crime Map application that is backed by a MySQL database, allowing users to submit information on and the location of crimes in order to plot danger zones and other crime trends within an area. In the final project, we combine Flask with more modern technologies, such as Twitter's Bootstrap and the NoSQL database MongoDB, to create a Waiter Caller application that allows restaurant patrons to easily call a waiter to their table. This pragmatic tutorial will keep you engaged as you learn the crux of Flask by working on challenging real-world applications. Style and approach This book will provide you with rich, practical experience of Flask. Every technology, that is employed along with Flask is comprehensively introduced, while the book focusses on developing web applications. Pointers to educational material are always given if you want to gain in-depth knowledge of the various technologies used.
A Newport Christmas Wedding
A Newport Christmas Wedding
Noble, Shelley
¥27.91
It’s Christmas in Newport. The mansions are decorated, and the streets are filled with excitement. Across the bay, preparations are in full swing for the wedding of Meri Calder-Hollis and Alden Corrigan. A year ago, Meri never imagined that she would marry her best friend, Alden, or become stepmother to his two teenaged children, Nora and Lucas.But as the wedding day draws near, tension and emotions run high, and Meri’s happiness turns to uncertainty. Nora is suddenly acting sullen and withdrawn, Alden is preoccupied, and Meri wonders if her marriage will bring the family closer together or tear them apart.It seems like this wedding may be doomed before it begins until a special Christmas surprise brings home the meaning of family and the joy of the holidays.
The Cutting
The Cutting
Hayman, James
¥66.50
The first novel in the nationally bestselling McCabe and Savage series—perfect for fans of John Sandford and CJ Box.Someone is stealing the hearts of beautiful women... Detective Mike McCabe moved from a top homicide job with the NYPD to Portland, Maine to leave his failed marriage and suspicions of wrongdoing behind, and to find a more peaceful life for himself and his 13 year old daughter. But the small New England city is not nearly as safe as he thought. On a warm September night, a missing high-school athlete is found dead in a scrap metal yard, her heart removed from her body with surgical precision. As outrage over the killing spreads, a young business woman disappears while out on a morning jog. McCabe is certain both crimes are the work of one man—a murderer skilled in cardiac surgery who is using his scalpel to target young women. With the clock ticking, McCabe and his partner Maggie Savage find themselves in a desperate race against time to find and rescue the missing woman before she becomes the next victim of the sadistic killer's blade.
Promises to Keep
Promises to Keep
Haynes, Elizabeth
¥10.86
Haunted by a tragic death, Jo finds temporary respite from the all-consuming memories through running; it's the only thing that is keeping her sane. So when she discovers a young boy living rough in the woods, Jo is determined to do everything within her power to keep him safe.DS Sam Hollands wants to get her relationship back on track, unsure of how to make things right. But everything changes when she returns from work one night to find a stranger in her home . . .This is a stunning, psychologically-rich short story from one of the most authentic and compelling voices in crime fiction.Promises to Keep is a short story that includes a sneak peek from Behind Closed Doors by Elizabeth Haynes, the second novel in the Briarstone Crime Series featuring DCI Louisa Smith.
The Berenstain Bears Chapter Book: The G-Rex Bones
The Berenstain Bears Chapter Book: The G-Rex Bones
Berenstain, Stan & Jan
¥21.51
Something strange is afoot at the museum, and the cubs are out to solve the mystery! With the help of Professor Actual Factual, the Bears must find the culprit who planted fake fossils at the museum and recover the missing bones! But with Dr. Zoltan Bearish hot on their trail, the cubs may be in for more of an adventure than they bargained for.
The Berenstain Bears Chapter Book: Queenie's Crazy Crush
The Berenstain Bears Chapter Book: Queenie's Crazy Crush
Berenstain, Stan & Jan
¥21.51
When Too-Tall, the town bully, discovers that his main squeeze, Queenie, is crushing on another cub, he sets out to find the culprit. But could it be that the answer is not what Too-Tall bargained for?
The Berenstain Bears Chapter Book: Camp Crush
The Berenstain Bears Chapter Book: Camp Crush
Berenstain, Stan & Jan
¥21.73
When Brother and Sister Bear decide to go to Camp Grizzmeyer for the summer, they expect to have a great time swimming, canoeing, playing tennis, and doing arts and crafts. What the bear cubs don't bargain for is the eerie romance in the air that keeps drawing the boy and girl campers together!The Berenstain Bears Chapter Books are the perfect next step for increasingly independent young readers.
The Berenstain Bears Chapter Book: Go Hollywood
The Berenstain Bears Chapter Book: Go Hollywood
Berenstain, Stan & Jan
¥21.51
Lights, Camera, Action! When Hollywood comes to Bear County, everyone is star struck! Can the bears keep their wits about them while in the spotlight?The Berenstain Bears Chapter Books are the perfect next step for increasingly independent young readers.
The Berenstain Bears Chapter Book: The Magic Crystal Caper
The Berenstain Bears Chapter Book: The Magic Crystal Caper
Berenstain, Stan & Jan
¥21.51
The Berenstain Bear Cubs are especially lucky to have Grizzy Gran as their grandmother. Using her magic crystal ball, Grizzy Gran can predict the future! That is, until Ripoff Ralph sets his sights on stealing the magic crystal ball for his own schemes. Can the Bear Scouts put an end to Ralph's shenanigans and make sure the ball remains safe?The Berenstain Bears Chapter Books are the perfect next step for increasingly independent young readers.
The Berenstain Bears Chapter Book: The Evil Eye
The Berenstain Bears Chapter Book: The Evil Eye
Berenstain, Stan & Jan
¥21.73
In this 100-page illustrated chapter book, Ralph Ripoff is up to his old tricks again, only this time he has teamed up with Weasel McGreed! They plan to hypnotize Bigpaw using the evil eye. Brother, Sister, Lizzy, and Cousin Fred know they must help their friend. But can they put an end to the scheme before Bigpaw is hypnotized and ordered to "swat" the Bear Scouts?The Berenstain Bears Chapter Books are the perfect next step for increasingly independent young readers.
Flat Stanley's Worldwide Adventures #10: Showdown at the Alamo
Flat Stanley's Worldwide Adventures #10: Showdown at the Alamo
Brown, Jeff
¥28.01
Just in time to celebrate the 50th anniversary of Flat Stanley, our favorite flat hero, Stanley Lambchop, heads to Texas, where a showdown at the Alamo will make this the most exciting of all his Worldwide Adventures! In this tenth installment of Jeff Brown's humorous Flat Stanley's Worldwide Adventures series, readers will soar through unforgettable adventure, witness friendship at its best, and learn tons of fun facts about the Lone Star State! And for parents and teachers, each Flat Stanley book is aligned to the Common Core State Standards, like multicultural adventure, plot and character development story elements, and compare and contrast.In this easy-to-read and incredibly hilarious chapter book, Stanley and his friends head to the big state of Texas to visit their pal Eduardo. From rocking out onstage at a music festival, to riding a horse, to parasailing in the desert, Stanley is having the time of his life! But when a mysterious truck starts following the friends, tensions run high. Who could it beAnd what do they wantA suspenseful and surprising showdown at Texas's historic Alamo will reveal all . . . including Stanley's courageous inner cowboy.Supports the Common Core State Standards
Flat Stanley's Worldwide Adventures #12: Escape to California
Flat Stanley's Worldwide Adventures #12: Escape to California
Brown, Jeff
¥72.93
Flat Stanley is back to save the day in the twelfth exciting Worldwide Adventures chapter book, just in time to celebrate his fiftieth anniversary! This time, we follow Flat Stanley as he explores San Francisco, California. The Lambchops are on a family vacation to San Francisco. But when Stanley saves a girl from barreling down one of San Francisco's steep hills in her wheelchair, he's shocked to find that she's actually been looking for him. The girl, Lily, is trying to perform an amazing trick that no one has done before—escaping from Alcatraz prison—and she needs Stanley's help! Can the famous flat boy help in this sticky situation?Not only will kids love going on a fun adventure with Stanley, this installment of the Worldwide Adventures series has fun, fascinating facts about San Francisco in the back of the book, and is perfect for Common Core State Standards, like multicultural adventure, plot and character development story elements, and compare and contrast.Supports the Common Core State Standards
A Riddle in Ruby
A Riddle in Ruby
Davis, Kent
¥44.85
Ruby is a thief-in-training and a keeper of secrets—ones she doesn't even know herself. A Riddle in Ruby is the first book in a witty and fast-paced fantasy-adventure trilogy for fans for Jonathan Stroud, Septimus Heap, and The Very Nearly Honorable League of Pirates.Ruby Teach, daughter of a smuggler and pirate, has been learning how to swindle and steal and pick the most complex locks for as long as she can remember. But a collision with aristocratic young lord Athen sends her spinning into chaos. Little did she know that her whole life has been spent in hiding from nefarious secret societies and the Royal Navy . . . who are both now on her trail. In this debut middle grade adventure, Kent Davis weaves a rip-roaring tale through an alternate colonial Philadelphia. A world where alchemy—that peculiar mix of magic and science—has fueled the industrial revolution. With this highly original setting, a cast of fully rounded characters and rapid-fire, funny dialogue, A Riddle in Ruby will call to mind fantasy greats like Diana Wynne Jones and Terry Pratchett.
Iron and Blood
Iron and Blood
Habershaw, Auston
¥21.73
Part II of the Saga of the Redeemed picks up right where The Iron Ring left off …After Tyvian Reldamar gets double-crossed by his business partner, he is affixed with an iron ring that prevents the wearer from any evildoing. Not one to be deterred by this setback, he quickly puts into motion a plan for revenge—one that will use every dirty trick in the book.But things are never simple for mastermind Tyvian, especially not after he uncovers a sinister plot: evil wizard Banric Sahand is planning to decimate the city of Freegate. Now Tyvian must learn to work with—and rely on—his motley crew of accomplices, including an adolescent pickpocket, an obese secret-monger, a fearsome gnoll, and a Mage Defender…who is also trying to get him arrested. Time is running out for Tyvian's plan for revenge—while the fate of the city hangs in the balance.
Feedback
Feedback
Wells, Robison
¥60.87
Perfect for fans of James Dashner's The Maze Runner, Feedback is the heart-stopping sequel to Variant—which Pittacus Lore, author of I Am Number Four, praised as "an intense journey with some of the most shocking twists and turns I've ever read."Benson Fisher escaped from Maxfield Academy's deadly rules and brutal gangs. He thought that the worst was over.But now Benson is trapped in a different kind of prison—a town filled with familiar faces. Classmates from Maxfield who Benson had seen die. Friends he was afraid he had killed.They are all pawns in the school's twisted experiment, held captive and controlled by an unseen force. And while Benson struggles to figure out who, if anyone, can be trusted, he discovers that Maxfield Academy's plans are darker than anything he imagined—and they may be impossible to stop.