It’s a book you only want to buy if you already have, or intend to purchase, the first two books, as this is the last part of a trilogy, and it doesn’t really work as a stand-alone story. It does offer a blurb on the back of the book directing readers who are unfamiliar with the previous books to a website where they can get filled in, as well as to additional extension activities and games. While I appreciate the bonus of offering the book/tech connection, I would rather the story didn’t depend on readers having access to the tech piece in order to make sense of the book. Not all students have easy access to technology, and some who do might not read the back to know about it. It would have been nice if the book did a better job of providing the necessary background bits within its covers, either with a prologue, or extra explanations/reminders woven into the main body of the text. Students aren’t always careful about making sure to read series books in order, and this one really needs to be. It picks up after some sort of previous disaster has left a high-tech town full suspicion toward their many robots, and has left a young boy so desperate to bring his parents back from some sort of digital trap that he’s willing to break the diabolical bad guy out of prison and work with him because he’s the only one who has the power to bring his parents back. You can imagine how that works out. Never trust the villain when he says he’s changed.