Shutter Island

U.S. Marshals Edward 'Teddy' Daniels and Chuck Aule arrive at Shutter Island, a high-security mental institution. They are immediately informed about a missing patient named Rachel, whose disappearance prompts their investigation.

They meet Deputy Warden McPherson, who stresses the dangerousness of the male and female patients divided between facilities. The two marshals are warned that they require supervision to enter certain restricted areas, particularly Building C, which houses the most violent individuals.

Dr. Cawley discusses the ongoing debates in mental health treatment regarding surgical interventions versus new medications. He reveals the horrific crime committed by Rachel, who believes her murdered children are still alive, adding urgency to their investigation.

In Rachel's room, Teddy and Chuck discover a cryptic note that reads, 'Where is number 67?' This leads to growing tension among the staff as they discuss the missing doctor, aggravating Teddy's frustration.

Teddy is haunted by flashbacks from his time as a soldier in WWII. He recalls his traumatic experiences at the Concentration Camp Dachau and his violent encounters that contribute to his troubled psyche.

As Dr. Naehring continues to appear in Teddy's life, he becomes increasingly paranoid about the secrets held within the asylum. Teddy suspects that patients might be coached to keep silent.

Teddy and Chuck are coerced into changing into patient uniforms, further blurring their identities as marshals. This immerses them deeper into the manipulative environment of Shutter Island.

Teddy and Chuck exploit a power failure to venture into Building C, where Teddy meets George Noyce. Noyce warns him to forsake thoughts of his wife and Laeddis to escape the institution's clutches.

In a cave, Teddy encounters a woman claiming to be Rachel who warns him against accepting the hospital's pills and cigarettes. She insists that doing so could result in his commitment as insane.

Chuck suddenly disappears, and Crawley tells Teddy that he arrived alone, deepening Teddy's feelings of isolation. Visions of his wife continue to haunt him, advising him against approaching the lighthouse.

Determined to uncover the truth, Teddy sneaks into the lighthouse where he encounters Crawley. Here, he confronts the startling revelation that he is actually Andrew Laeddis, a patient at the institution.

Inside the lighthouse, Crawley reveals that Rachel Solando and Dolores Chanal are figments of Teddy's imagination, created to escape his overwhelming guilt over his family's tragic death. This confrontation forces Teddy to reckon with his past.

Teddy confronts the harsh reality of his actions and the trauma he has buried regarding his children’s deaths. Crawley urges Teddy to accept the truth, setting the stage for an emotional reckoning.

As Teddy and Chuck discuss escape, Chuck's insinuations suggest that Teddy may be spiraling towards another lobotomy. Teddy hints at giving up his search for the truth, indicating a dangerous regression.