Sure! Here's an unique and concise movie description of 5-6 sentences, in English using simple and compelling language, without revealing the plot or referencing cast and crew, given the metadata: A group of asbestos cleaners, led by Gordon Fleming, venture into an abandoned psychiatric hospital with a dark history as they embark on a mission to remove asbestos from the building. Mike, a crew member, discovers nine audio tapes of a patient's therapy sessions, which reveal a dark crime committed by a patient named Mary Hobbes. As they continue their job, strange occurrences begin happening, causing tension among the crew members as they unravel secrets about the hospital's past. In the stairwell of the hospital, Jeff, another crew member witnesses Hank staring out a window wearing sunglasses and talking to himself. Hank goes missing soon after, and the crew searches for him, leading to terrifying encounters in the tunnels beneath the hospital. Ultimately Gordon arrives at the hospital and finds Hank wrapped in plastic sheeting before being confronted by Phil, who tells him to "wake up" before disappearing in front of him. A disoriented Gordon stabs Craig with a lobotomy pick before realizing he has killed each of his crew members. Distraught and confused, Gordon attempts to call home to apologize to his wife.

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Some movies that have similar genres and were produced around the same time as Session 9 include The Devil's Advocate, Event Horizon, Cure, What Lies Beneath, Jeepers Creepers, The Faculty.

Session 9 was released in theaters on August 10, 2001.