Directed by Jose Larraz, 1973
A horror from Spanish ex-pat José Larraz which unexpectedly became the official British entry to the 1974 Cannes Film Festival.
Anne (Lorna Heilbron) visits her friend Helen (Angela Pleasence) at her remote and dilapidated house in the English countryside. She can't shake the feeling that someone else is in the house with them, and is curious about Cora, a girl in a photograph that Helen seems reluctant to talk about. Helen becomes increasingly agitated when Anne's estranged boyfriend John arrives at the house and when she later spies on Anne talking to the sinister gamekeeper, Brady (Peter Vaughan - Grouty in Porridge).
When Anne takes a nocturnal trip to the attic to investigate strange noises, a now insane Helen stabs her to death and props her body up in an armchair, where it's discovered by John - who Helen also murders. Helen is forced to kill again when the gamekeeper discovers Cora's body in the lake and goes to the house planning to blackmail Helen. When the housekeeper arrives the following morning, she finds a catatonic Helen surrounded by the bodies of Anne, John and Brady.