Annie Graham, an artist building scale models, lives with her husband Steve, their teenage son Peter, and young daughter Charlie. Annie delivers a eulogy at the funeral for her mother Ellen, commenting that she had interests of which even Annie didn't know. Charlie tells Annie that Ellen always told her that she wished Charlie had been born a boy. Steve is informed that Ellen’s grave has been vandalised, while Annie, apparently seeing Ellen in her workroom, begins researching the supernatural. At a support group, she reveals that her schizophrenic brother accused Ellen of trying to put people inside his body and committed suicide, while Ellen herself suffered from dissociative identity disorder. After Charlie wanders out of the house following a fiery vision of Ellen, Annie makes Peter take his sister along when he wants to go to a party. There, Charlie eats a piece of chocolate cake containing nuts, and falls into anaphylactic shock. As Peter speeds to the hospital, Charlie sticks her head out of an open window in an attempt to breathe better. When Peter swerves the car to avoid hitting an animal, Charlie is decapitated when her head hits a telephone pole. In shock, Peter slowly drives home and goes to bed without checking on her. The next morning, he lies in bed and forces himself to listen to Annie’s screams when she finds Charlie’s corpse in the backseat of the car.