Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Shutter Island

I thought it was a great book. It started a little slow and I wasn't sure what was happening at some points in the book and had to go back and reread a little bit of it. But overall I loved it. It had a great plot about a marshal going to the island with a partner he just met in order to find a missing woman. As the story progresses you also start to find out about the marshals wife. The story jumps back and forth between the two different times, the island and time with his wife. The story has a twist end which can be figured out by about three quarters of the way through but still a really good story line and well worth the read.