If Shutter Island were given a subtitle, the most accurate would be This line, delivered in the film’s final moments, functions as its thematic subtitle. It encapsulates the central question facing U.S. Marshal Teddy Daniels (Leonardo DiCaprio): Is he Andrew Laeddis, a violent patient trapped in a delusion, or a righteous investigator uncovering a conspiracy?
Teddy finds a note hidden in Rachel’s room: "The law of 4. Who is 67?" Minutes later, a patient grabs his face: "You’ll die here. They’ll burn out your brain." By then, you believe her. shutter island with subtitle
Two interpretations dominate: