Dive into the eerie and enigmatic world where the line between sanity and madness blurs. This curated list of detective films set in psychiatric hospitals offers a unique blend of suspense, psychological depth, and thrilling investigations. These movies not only entertain but also challenge our perceptions of mental health, reality, and the human psyche, making them a must-watch for fans of both detective stories and psychological thrillers.

The Snake Pit (1948)
Description: Virginia Cunningham, a woman suffering from amnesia, is committed to a psychiatric hospital where she undergoes various treatments and tries to piece together her past.
Fact: The film was one of the first to address the treatment of mental illness in a realistic manner, influencing public perception and policy.
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The Ninth Configuration (1980)
Description: Colonel Vincent Kane takes over a military psychiatric hospital where he encounters a group of ex-soldiers with various mental disorders, leading to a bizarre and philosophical exploration of sanity.
Fact: The film was written and directed by William Peter Blatty, who also wrote "The Exorcist." It was initially released with the title "Twinkle, Twinkle, Killer Kane."
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The Attic Expeditions (2001)
Description: Trevor Blackburn, after being acquitted of murder, is sent to a psychiatric hospital where he undergoes bizarre treatments, blurring the lines between reality and his own twisted perceptions.
Fact: The film features a cameo by Jeffrey Combs, known for his roles in horror films.
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Session 9 (2001)
Description: A crew hired to clean up an abandoned psychiatric hospital starts experiencing psychological disturbances, leading to a descent into madness and uncovering the hospital's dark history.
Fact: The film was shot in the Danvers State Hospital, which was known for its gothic architecture and history of patient mistreatment.
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The I Inside (2004)
Description: A man wakes up in a psychiatric hospital with no memory of his past, only to find himself reliving the same day over and over, trying to solve the mystery of his condition.
Fact: The film is based on the play "The Inner Circle" by Michael Cooney.
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The Haunting in Connecticut (2009)
Description: While not strictly a detective film, it involves a family renting a former funeral home turned psychiatric hospital, where they encounter paranormal activities and must uncover the truth behind the hauntings.
Fact: The film is loosely based on the real-life Snedeker family's experiences, which were also the subject of a Discovery Channel documentary.
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Shutter Island (2010)
Description: In this gripping tale, U.S. Marshal Teddy Daniels investigates the disappearance of a patient from a psychiatric facility on a remote island, only to uncover layers of deception and his own troubled past.
Fact: The film was based on the novel by Dennis Lehane. The lighthouse, a key location in the film, was built specifically for the movie on Peddocks Island in Massachusetts.
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The Ward (2010)
Description: Kristen, a young woman with amnesia, finds herself in a psychiatric ward where she must unravel the mystery of her identity and the haunting presence of a ghost named Alice.
Fact: This was John Carpenter's first film in over a decade, marking his return to directing.
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Stonehearst Asylum (2014)
Description: A young doctor arrives at a secluded asylum to work under the guidance of its charismatic superintendent, only to discover the staff and patients might not be what they seem.
Fact: The film is based on Edgar Allan Poe's short story "The System of Doctor Tarr and Professor Fether."
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The Jacket (2005)
Description: Jack Starks, a Gulf War veteran, is placed in an experimental treatment at a psychiatric hospital where he experiences visions of the future, leading him to solve his own murder.
Fact: The film was shot in various locations in Scotland, including the abandoned Lennox Castle Hospital.
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