Two sisters live alone in a mansion: Baby Jane Hudson, a child star, and Blanche whose career as an actress was cut short by a crippling accident. Baby Jane has "taken care" of Blanche since her accident.

While driving down a lonely road late one evening, Hammer picks up a beautiful blonde hitchhiker, dressed in nothing but a raincoat. At first, Hammer assumes that the incoherent girl is an escaped lunatic; his mind is changed for him when he and the girl are abducted by two thugs. The men torture the girl to death as the semiconscious Hammer watches helplessly. He himself escapes extermination when the murderers' car topples off a cliff and he is...