Sarah, who has been blinded in a horse-riding accident, travels to the stately home of her uncle George Rexton. On a date with her boyfriend, Steve Reding, tragedy follows them back to the estate: the three members of the family are murdered, and the gardener Barker has been shot. The danger is real and the atmosphere is tense, as a psychotic killer stalks the grounds.
Sarah returns to the house and spends the night there, completely unaware that the corpses of her relatives lie scattered in different rooms. It isn’t until she eventually uncovers the grim scene that the danger becomes personal. Barker, who survived the shooting, manages to speak long enough to tell Sarah what happened and to warn her that the killer plans to return to retrieve a bracelet he left behind, directing her to its location before he dies.
The bracelet bears an engraving, and Sarah correctly suspects it belongs to the killer. True to the threat, the killer comes back in search of his missing token. His face is withheld from the audience for most of the film, shown only from the knees down in rugged jeans and distinctive leather boots, until the final scene reveals his identity. In a desperate bid to escape, Sarah flees on horseback into the woods and is rescued by a nomadic family of gypsies.
When Sarah shows the bracelet to the gypsy family, its inscription reads “Jack”, prompting Tom, the head of the family, to conclude that his brother Jack must be the killer, since he was dating Sarah's cousin Sandy Rexton—one of the murdered women. To shield his brother, Tom pretends to escort Sarah to the police, but instead locks her in a secluded shed to bring the family together and flee.
Sarah makes a daring escape and is found by Steve, who rallies his men and heads back to help. He leaves Sarah at his house to recover while they continue the hunt for the killer, whom they still assume is a Gypsy. In their pursuit, they encounter the two Gypsy brothers, and Jack explains that the bracelet’s inscription was not what it seemed—the name reads “Jacko”.
With this new clue, Steve learns the killer’s real name and hurries off with his men. Back at his own home, it’s revealed that Jacko is one of Steve’s own workers left behind to guard Sarah. The chase intensifies as the killer remains determined to recover the bracelet. He moves through Sarah’s clothes beside the bathtub; she pauses, touching his hand, and the moment of danger escalates when Jacko attempts to drown her. Just in time, Steve bursts in to save her, restoring a narrow, tense arc of safety amid the looming threat.
