Dark Sacred Night (Harry Bosch Series #21 and Renée Ballard Series #2)

Harry Bosch teams up with LAPD Detective Renée Ballard to face the unsolved murder of a runaway, and the fight to bring a killer to justice.

Detective Renée Ballard is working the night beat -- known in LAPD slang as "the late show" -- and returns to Hollywood Station in the early hours to find a stranger rifling through old file cabinets. The intruder is retired detective Harry Bosch, working a cold case that has gotten under his skin.

Ballard can't let him go through department records, but...