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Amanda (Susan Bracken) receives a strange phone message beckoning her to the side of her ailing, elderly grandmother (Rhea MacAdams). She hasn't been to her hometown for 13 years, not since the night that her mother was butchered in bed by an unknown maniac. Amanda returns to her grandmother's sprawling house and finds her being "cared for" by a local doctor (James Harrell) who has prescribed suspicious medicines and refuses to admit the delirious old woman to the hospital. Not only that, but control of the estate is being fought over by the wealthy, powerful Judge Stemple (Gene Ross) and Claude Kearn (Larry O'Dwyer), the man who runs the local historical society. Amanda forcefully claims her rights as kin and calls an ex-boyfriend, a doctor named Nick (Hugh Feagin) who agrees to take over her grandmother's medical care. After the old woman is safely in the hospital, however, Amanda starts getting a series of disturbing phone calls. A threatening voice is demanding humiliating favors and dropping hints that he's the same madman who killed her mother. Amanda has no idea who to trust, so every time the doorbell rings in the middle of the night, she is forced to face greed, murder, and insanity.