The Closers by Michael Connelly
Harry is back, assigned to the LAPD's Open Unsolved Unit with his former cop ally and partner, Kizmin Rider. These detectives are the Closers. They are thrown into a politically sensitive and dangerous case when a white supremacist is connected to the 1988 murder of a mixed-race girl.
The police department has changed, but one thing hasn't - 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...