Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing

What is up? Struck out again. A cop mystery. Ben is a small town cop who gets dragged into a 20-year-old mystery involving several Boston cops and a drug lord. Lots of violence and bad language. I did figure out who one of the top baddies was, though. This is one of the rare books I wish I had not read. Disturbing. (Side note: as some have complained, the narrator violated the contract with the reader; that is, he lies about his involvement in the case. We don't know if he is a reliable narrator, an honest story-teller. ...But this was a minor complaint of mine. Even without this strike against the book, it has plenty of other reasons I didn't enjoy it.)