Shutter Island

Main Characters and Their Development

• Teddy Daniels: An experienced U.S. Marshal who arrives on Shutter Island to investigate the disappearance of a patient from the psychiatric clinic. His troubled past, including the loss of his wife, influences his perception of reality and his actions on the island.
• Chuck Aule: Teddy's partner, a new marshal who quickly becomes his trusted friend. His past and present are shrouded in mystery, and by the end of the book, it is revealed that he is part of the island's larger mystery.
• Dr. John Cawley: The chief psychiatrist at the Shutter Island facility. He is a key figure in the investigation of the missing patient. His professionalism and treatment methods are questioned during Teddy's inquiry.
• Rachel Solando: The missing patient whose absence is the central plot point. As Teddy's investigation progresses, her secrets and their connection to his personal traumas are revealed.