In the English countryside, Sarah Rexton (Mia Farrow), recently blinded in a horse riding accident, moves in with her uncle's family and gallantly adjusts to her new condition, unaware that a killer stalks them. After her former boyfriend Steve presents Sarah with a new horse and suggests they resume their romance, she returns home and discovers the bodies of her murdered relatives. A cat and mouse game commences as the sightless woman evades the killer while trying to learn his identity.