Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book was great! Five Stars!!!

This book was great! It was one of the best I have ever read! Valiant is about a girl who finds out her boyfriend and mother are having an affair. She runs away and join some other teens who live in the subway tunnels. She joins them and meets a troll who she ends up falling in love with. It was hard to put down because it had a lot of adventure and detail! Holly Black was able to make the lives of the teenagers in this book seem very realistic. I never thought that something in the book couldn't happen in real life, because the way Holly Black wrote this book made it believable. Holly Black has depicted the fairy world and real world very well! She is not afraid to use foul language or adult matters in her book. This book is for more mature teens. Holly Black has depicted the fairy world and real world very well! If you are able to ignore the language then you should definitely read this book as it is a must read!