Wynne Kinch, an adopted 14-year-old girl, has a crush on her 32-year-old stepbrother, George. While spying on George in the bathroom, Wynne notices he has several scratches on his back, and finds a jumper she made for him thrown in the rubbish, with blood on it; this leads her to suspect him of being the serial killer of several local teenage girls, who is still at large. Despite this belief, Wynne continues to have romantic sexual fantasies about George, and dreams of marrying him when she comes of legal age.
Throughout the film, she regularly visits the house she previously lived in with her adoptive family.
Later on, Wynne searches the back of George's van, hoping to find clues but is forced to stay inside and hide when he gets in and drives off. He drives to a house and Wynne discovers that he is having an affair with a mentally unstable woman, whose blood was on the discarded jumper after she had slashed her wrists in a suicide attempt.