The Ninth Configuration

The Ninth Configuration also known as Twinkle, Twinkle, Killer Kane is a 1980 American film directed by William Peter Blatty. The film is based on Blattys novel The Ninth Configuration 1978, which was itself a reworking of an earlier version of the novel, first published in 1966 as Twinkle, Twinkle, Killer Kane. The initial 1966 publication of the novel featured an exclamation mark at the end of the title, while all subsequent publications saw it removed.

In the 1970s, a large castle is used by the US Government as an insane asylum for military personnel. Among the many patients there is a former astronaut, Billy Cutshaw Scott Wilson, who aborted a moon launch and was dragged screaming from the capsule, suffering from an apparent mental breakdown.Colonel Kane Stacy Keach, a former member of a United States Marine Corps special unit, arrives at the castle to take over the treatment of the patients. He meets Colonel Fell Ed Flanders, who helps Kane acclimate himself to the eccentricities of the patients. Kane pays special attention to Cutshaw, repeatedly asking him why he did not want to go to the moon. Cutshaw refuses to answer but instead gives him a St. Christopher medal. ........

Source: Wikipedia