Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed....

Every year I look forward to reading the new Jonathan Kellerman book. This year's book was a disappointment. The characters of Alex and Milo seemed flat... Usually, I pick up a Kellerman book and I can't put it down...I had no problem putting this book down. My sister borrowed the book and was glad she hadn't purchased it... Maybe Kellerman is bored with the characters of Alex and Milo...Billy Straight was a much better book...