It's been a good six years or so since I saw the movie so I had pretty much forgotten all about the twist. This psychological suspense novel has pretty good build. It keeps leaving you with more questions. US Marshal Teddy Daniels is sent to Shutter Island to look for a missing woman. The island houses the Ashecliffe Hospital for the Criminally Insane and all of the inmates are violent and crazy. Teddy and his partner are having a tough time getting answers and everything is getting jumbled. Are they doing illegal treatments on the patients? How could this woman have escaped? What are they hiding? Dark, disturbing, and the twist will leave breathless!