After three years as a PI, Harry Bosch returns to the LAPD, working with his former cop ally and partner, Kizmin Rider. Harry and Kiz are assigned to the LAPD's Open-Unsolved Unit.

These detectives are the Closers; they put a shovel in the dirt and turn over the past.

Harry and Kiz are immediately thrown into a politically sensitive and dangerous case when a DNA match connects a white supremacist to the 1988 murder of a mixed race 16-year-old girl. As he navigates the case, Harry finds a police department far different from the one he left three years earlier. A new Chief has been brought over from New York to change the bad old culture of corruption - or that's the theory. But one thing hasn't changed - Harry's nemesis, Irving. The former Deputy Chief has been pushed from power and given a virtually meaningless new role. Full of vengeance, Irving calls Harry a 'retread'. He watches from the sidelines like an injured bear, hoping Harry will make a mistake ...