An activist is killed in a cute Los Angeles trolley car on the Angels Flight railway, far from Harry Bosch's Hollywood turf. But the case is so explosive - and the dead man's enemies inside the LAPD are so numerous - that it falls to Harry to solve it. The pressure is crushing. The streets are superheating, his marriage is unravelling and the hunt for a killer is leading Harry to another high-profile LA murder, one where every cop had a motive. The question is: did any have the guts?