Shudders from "Shutter Island"

While traveling recently I finished reading Dennis LeHane's Shutter Island.  I was intrigued by the trailers for the movie (which I've not yet seen).  U.S. Marshals arrive on an island which is home to a high-security mental institute for the criminally insane; their task, to investigate the disappearance of one of the patients/inmates.  Suspense, mystery, creepiness, a dark gothic setting, and a healthy dose of insanity make for a story whose conclusion caught me completely by surprise.  Always fun when you don't see it coming!  And just enough to make you think, and you leave you feeling slightly "disturbed."  I highly recommend this book - if you haven't already seen the movie.