Double is about Chap, a runaway boy with no family or friends. When Chap is mistaken as Cassiel Roadnight, a missing boy, Chap decides to steal his life and becomes Cassiel so he can have the friends and family he always wanted. After wishing his whole life, he discovers that it's not quite what it seems. Chap begins to wonder about Cassiel's disappearance and starts to think that Cassiel might not have disappeared after all. I would definitely recommend this book, especially to people who like mysteries.