City of Bones by Michael Connelly

A dog finds a bone, leading detective Harry Bosch in search of a 24 year-old child killer. His partner, Edgar, is frustrated with Harry who heads out on his own in search of answers. His boss knows Harry has the right stuff but he isn't a team player. When the media exposes a suspect who then commits suicide, Harry plays hard-ball. Looks like Harry might not be at his job much longer if he doesn't start playing by the rules. A great, twisted, tale of murder, suspense and thrills. Hard to put down.