Killer's Moon is a 1978 British slasher film[3] 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.

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.

Meanwhile, one of the girls, Sandy, discovers the gamekeeper's body in the woods, and encounters Mike, a benevolent tourist who is camping nearby with his friends, Julie, and the American Pete.

While Mike goes to retrieve a shotgun from his car, Pete travels on foot to the hotel, seeking help, and is confronted by Mr. Jones, who attacks him.

Shortly after, the four assailants, still holding Mary captive, attempt to coax Anne, Elizabeth, and Agatha out of their room by shouting that a fire has broken out in the hotel.

Jones stumbles upon the campsite where a terrified Sandy and Julie hide in a tent, but is killed by a three-legged Doberman Pinscher that the men had recently mutilated.

During the mid-to-late 1970s, maverick directors such as Pete Walker and Norman J. Warren were trying to spice up the much-derided genre of British horror films.

Alan Birkinshaw had begun his career in commercials, moving on to directing and producing Confessions of a Sex Maniac in 1974, and viewed making horror films as a natural progression.

However, by adding (faked) animal cruelty and the flippant treatment of rape, Birkinshaw created what was described in Matthew Sweet's book Shepperton Babylon as the most tasteless movie in British cinema history.

Killer's Moon was met with controversy from the British Board of Film Classification (BBFC), particularly for its depiction of rape involving minors.

Killer's Moon received a rare UK cinema screening in 2001 as part of the 'Ten Years of Terror' one-day film convention held at the Riverside Studios in Hammersmith, London.