Mentally scarred by her parents' violent deaths, Helen Sparrow was sent for treatment at a residential psychiatric clinic. Now discharged, she returns to a shadowy old mansion, the scene of both the murders and her repressed, unhappy childhood. But she senses an evil presence in the house: something that follows her along the gloomy halls and whispers just on the edge of her consciousness. Is she insane? Or does some supernatural echo of that terrible...