Killer's Moon is a 1978 British slasher film written and directed by Alan Birkinshaw, with uncredited dialogue written by his novelist sister, Fay Weldon, and starring Anthony Forrest, Tom Marshall, Jane Hayden, JoAnne Good, Nigel Gregory, David Jackson, and Lisa Vanderpump. It follows a group of schoolgirls on a choir trip who are terrorized by four escaped psychiatric patients on LSD while staying in a remote hotel in the Lake District.

Plot

A coach full of schoolgirls breaks down in the Lake District, forcing the girls to take shelter for the night in a remote hotel. Meanwhile, strange and macabre acts of violence are occurring to the locals and their pets, perpetrated by four escaped mental patients—Mr. Smith, Mr. Trubshaw, Mr. Muldoon and Mr. Jones—who have been dosed with LSD as part of their treatment. The four men, roaming the area, are convinced they are living a shared dream in which they are free to engage in their demented fantasies of rape and murder.