Instruct: Classify a given review into positive or negative sentiment.
Query: I couldn't put this down!

This is an incredible book!!!! All two hundred and nineteen pages kept me mesmerized, which is something only Jane Austin and Louise Rennison have previously done. As the book jacket says, "Megan Whalen Turner weaves Gen's stories and Gen's story together with style and verve in a novel that is filled with intrigue, adventure, and surprise." The intrigue is supplied by the feud between the magus's apprentice and Gen, adventure fills the entire novel, and as for surprise, the ending heavily supplies that. The myths are entertaining, and when the mood gets a little too heavy, Gen's dry humor lightens things up. He is, in his own words, a very well behaved hammer.