Nobody ever gets out. In North Bend Psychiatric Hospital in rural Oregon, 1966 a patient called Tammy dies in strange and violent circumstances. Kristen (Amber Heard) is committed there after she burns down a house. She is suffering from amnaesia. It seems an angry spirit of a former patient is haunting the girls (Mamie Gummer, Laura-Leigh, Lyndsy Fonseca, Danielle Panabaker) who are being treated on her ward and they are disappearing one by one. Dr Gerald Springer (Jared Harris) pays Kristen no heed and in fact subjects her to terrible medical treatment when she warns of the girl called Alice Hudson who was a former inmate and whose ghost stalks the corridors. What did the others do to her to make her swear revenge? And why is she included? Kristen makes desperate escape attempts after the staff ignore her fear of losing her life to the spirit… You stay locked up long enough and you start to believe that you’re nuts. You’ll recognise some visual references to other films here – and what else would you expect from the maestro John Carpenter? This is a small-scale exercise in tropes from the medical horror sub-genre with an attractive cast playing it for real, even if there’s something of a tribute to Nurse Ratched by Susanna Burney in this Sixties-set Snake Pit. It may turn on the most rudimentary issues and beliefs of psychiatry and ideas about how a personality might take steps to insulate against past traumas but it’s probably true to the era. In the midst of the Mean Girls scenario are some observations about how people deal with being institutionalised in physically violent and threatening environments. However it’s fast and fun and efficiently dramatised by the great Carpenter. Written by Michael Rasmussen and Shawn Rasmussen. Sleep tight, sugar!