Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best book I have ever read!

I rate this book as one of the best I have ever read. On one hand it is a unique mystery story about a girl who discovers she is only a character in a book. On the other hand it explains the history of philosophy in such a simple and fascinating way that anyone can understand it. Even after the first chapter I realized I was reading one of the greatest books ever written. I would recommend that absolutely everybody buys this book. Once you read it you will never look at the world the same way again!