An activist attorney is killed in a little L.A. trolley called Angels Flight, far from Detective Harry Bosch's Hollywood turf. But the case is so explosive- and the dead man's enemies inside the L.A.P.D. are so numerous - that it falls to Harry to solve it. The hunt for the killer is leading Harry to another high-profile L.A. murder case, one where every cop had a motive. The question is, did any have the guts?