The story begins when policeman Frank Spivey finds a seemingly deranged man threatening to kill a blonde woman with a cleaver. The man tells Spivey that he doesn't "know what she is" and draws the cleaver. Spivey shoots the man dead to save his mysterious hostage. He comforts her, only to discover that while she has an attractive body, her face is monstrously ugly. Despite that, she seems to be affectionate and he becomes fond of her. However, Spivey starts to become obsessed with the monstrous being which takes a toll on his home life. It only worsens when Spivey takes Jenifer in, only for her to devour the family cat, bite into his wife's mouth, and scare away his wife and son.