After being blinded in a horse riding accident, Sarah (Mia Farrow) visits her uncle's stately home. Out on a date with her boyfriend, Steve (Norman Eshley), she escapes the fate of her relatives (Dorothy Alison, Robin Bailey, and Diane Grayson), who are murdered, along with the gardener, at their home by a psychotic killer. Sarah returns from her date and spends the night in the house, unaware that three of her family members' corpses are strewn about the house.