Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Huh?

Let me start off by saying mysteries are my favorite types of books, and a good one will keep me up all night. The first half of this book was one of those can't put down thrillers..and then it sank like a rock, ending in a way that was completely implausable and ridiculous. I hope Cornwell's next offerings are back up to par.