plot summary: The film is set in 1954. Federal marshall Teddy Daniels travels,with his partner Chuck Aule, to the government run mental institution for the criminally insane, on Shutter Island , near boston, to investigate the dissapearance of a prisoner. However, he is traumatised by what he saw in the war, and his wifes death. As he starts to investigate, he feels that the hospital aren't telling him he truth, and are hiding records from him. In a storm, communication with the mainland goes down and he is trapped there, as more prisoners 'escape' in the confusion. As he starts to investigate further he starts to doubt everything.