Answer
In "Shutter Island," Teddy Daniels (Leonardo DiCaprio) and Chuck Aule (Mark Ruffalo), two U.S. Marshals, investigate the disappearance of a patient from a mental hospital on a remote island. Kingsley, played by Max von Sydow, is the chief psychiatrist at the hospital and becomes a key figure in the unfolding mystery, as Teddy uncovers dark secrets and confronts his own troubled past.