After Harry Bosch's mentor, J.J. Thompson's funeral, his widow hands Bosch a murder book that Thompson took with him when he left the LAPD 20 years before - the unsolved killing of a troubled young man in an alley used for drug deals. Bosch and LAPD Detective Renee Ballard soon arrive at a worrying 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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