Helen Mallory is a beautiful young woman who has been unable to speak a word since seeing her husband and daughter die in a fire. She visits the home of her elderly, invalid grandmother and meets her uncle, Joe Sherman, a respected psychiatrist. The visit turns into a nightmare as she encounters Joe's brash brother Steven, as well as a pretentious Southern belle named Blanche and other mysterious characters in a house where everyone's life seems to be in grave danger.
