LAPD Detective Renée Ballard interrupts a stranger as he rifles through file cabinets at the station in the early hours of the day. It's retired detective Henry Bosch, who can't let go of the cold case of the death of 15-year-old Daisy Clayton. Ballard is initially annoyed with Bosch, but eventually teams up with him in order to bring justice to a young runaway who was brutally murdered.