The film Shutter Island follows U.S. Marshal Teddy Daniels who is investigating the disappearance of a woman from a hospital for the criminally insane located on a remote island. Teddy realizes the investigation will force him to confront his own fears. The opening sequence uses dark lighting and ominous music to set an unsettling tone. Long shots establish the isolated island setting and prison-like hospital. Mystery is built through withholding the identities of characters and keeping the plot ambiguous. These elements effectively introduce the psychological thriller genre and intrigue audiences to continue watching.