The Killer Nun

A 1979 Italian horror film, "Killer Nun" follows a nun who, after recovering from brain surgery, grows increasingly paranoid that her health is again declining; she begins indulging in opioids from the hospital in which she works, and spirals into addiction and madness with violent consequences. The film is loosely based on the true story of Cécile Bombeek, a middle-aged nun who committed a series of murders in a geriatric hospital in Wetteren, Belgium in 1977. With its disjointed narrative and dark themes, "Killer Nun" was originally banned in Britain as a "video nasty" but has since been released uncut on DVD.