Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A real sleeper and a gem of a story

There's always a few books that stand out in your book list -- ones you remember for too long afterwards. This was one of them for me and might well be for you too. It's not like other novels and the ending could sling you off into that not-so-good night with no flashlight. This is the kind of book Stephen King might keep on his night table, but it's not horror. It's psychological, an intrigue with excellent characters. Good luck.