Blood Relatives

In Montreal, the fifteen year-old Patricia Lowery and her seventeen year-old Muriel Stark are running in a rainy night seeking for shelter and out of the blue Muriel screams in an alley. Patricia runs to a precinct covered with blood and the police officers take care of her. Detective Steve Carella, who is investigating the murder case of Muriel, comes to the police station and interviews Patricia. She tells that her cousin and she had gone to a party, and a man attacked them in the alley forcing Muriel to have oral sex with her before killing her. The police force seeks out sex offenders with the description provided by Patricia, but she fails in the lineup. When Det. Carella finds Muriel's journal, he learns that the teenager logged every movement she takes in her diary and he raises suspicion in Patricia's statement.