Back when Harry Bosch was just a rookie homicide detective, he had an inspiring mentor. Now that mentor, John Jack Thompson, is dead, and his widow gives Bosch a murder book, one that Thompson took with him when he left the LAPD twenty years before -- the unsolved killing of a troubled young man. Bosch takes the murder book to Detective Renée Ballard and asks her to help him solve the mystery. The bond between Bosch and Ballard tightens as they become a formidable investigation team. And they soon arrive at a disturbing question: Did Thompson steal the murder book to work the case in retirement, or to make sure it never got solved?
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