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Back when Harry Bosch was just a rookie homicide detective he had an inspiring mentor, John Jack Thompson, who taught him to take the work personally and light the fire of relentlessness for every case. Now John Jack is dead and Harry inherits 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 brings the murder book to Renee Ballard and asks her to help him find what about the case lit Thompson's fire all those years ago. That will be their starting point.The bond between Bosch and Ballard tightens as they become a formidable investigative team. And they 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?