Summer, 1954 U.S. Marshal Teddy Daniels has come to Shutter Island, home of Ashecliffe Hospital for the Criminally Insane. Along with his partner, Chuck Aule, he sets out to find an escaped patient. But nothing at Ashecliffe Hospital is what it seems. And neither is Teddy Daniels. Is he there to find a missing patient? Or has he been sent to look into rumors of Ashecliffe's radical approach to psychiatry?