Detective Lilly Rush from Philadelphia Homicide reopens a 1976 murder case involving two wealthy families when the former housekeeper, who is now old and dying of cancer, comes forward claiming to have witnessed the murder of a young teenage girl who was found dead near a party hosted by her two wealthy brothers.

A serial rapist who terrorized the city five years earlier, leaving one woman dead, sends a letter to the detective squad letting them know that he is back and ready to strike again.