Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cheated by the "ending"...

I found most of this book to be a very good, fast read. But I was terribly disappointed by the ending, where Patterson abruptly pulled not one, but *two* bad guys out of a hat. There's an art to creating a good mystery/thriller; a technique of placing clues & hints for the reader to find, and Patterson for some reason decided to cheat at the end and just pulled the bad guys pretty much out of thin air. Very unsatisfying.