Challenger Deep, by Neal Shusterman, is a realistic fiction book about a high school student named Caden Bosch. He’s an artist who is making a video game with his friends. Slowly, he starts to notice things about a kid that he passes in the hallway everyday. He realizes that the kid wants him dead. Caden tries to explain the situation to his parents but he admits that neither he or the kid know each other. After that, his mind starts to take over and he spends more time on the pirate ship in his head. The antagonist is undefined in his mind and it goes back and forth from the captain, to the parrot, and himself.  As the school year goes on, he starts to get even more paranoid and his family has to make a hard decision. Eventually, the captain decides to sail to challenger deep, the deepest part of the mariana trench. 

I would recommend this book to the people who like confusing books that slowly puts pieces together as it goes on. The characters start to connect from the fantasy that he has created to reality. I think the difficulty would be a good level for high school students but would be good for middle schoolers who like the challenge. I enjoyed the book, but most of the time I was confused as to what was going on because of the complex wording, and then it all came together within the next few pages so overall a good book. Shusterman did a great job on keeping the ending a mystery, so most of the predictions I made were wrong. The thing I like most about this book is that the purpose of writing it was to show empathy toward those who have  mental disorders.