In 1916, beautiful young mute Helen is a domestic worker for elderly, ailing Mrs. Warren. Mrs. Warrens two adult sons, Albert (a professor) and womanizing impudent Steven, also live in the Warren mansion. Mrs. Warren becomes concerned for Helens safety when a rash of murders involving women with afflictions hits the neighborhood. She implores her physician, Dr. Parry, to take Helen away for her own safety. When another murder occurs inside the Warren mansion, it becomes obvious that Helen is in danger.