Orange County, CA, 1970s: Labeled as strange by her classmates and difficult by everyone else, thirteen-year-old Margo Mendoza finds solace in the comfort of her weekly music lessons and an obsession with clippings about infamous serial killers. But when beloved local girl Judith Ronstadt is found murdered, Margo's fascination begins to blur the lines between curiosity and something far more sinister. As one girl's death becomes the first of many, the fear of a serial killer spreads, leaving Margo to navigate a world filled with hatred, anxiety, and the loss of innocence. Haunted by Judith's murder, Margo's obsession follows her throughout her adolescence, shaping her identity and choices as she navigates seedy nightclubs, heat-filled concerts and the treacherous path between life and death.