Retiring from the LAPD but unable to stay away from law enforcement altogether, Harry Bosch peruses old files and becomes obsessed with an unsolved case that haunts his old precinct and Hollywood.

Harry Bosch is back as a volunteer working cold cases for the San Fernando police and is called out to a local drug store where a young pharmacist has been murdered. Bosch and the town's three-person detective squad sift through the clues, which lead into the dangerous big-business world of prescription drug abuse. Meanwhile, an old case from Bosch's LAPD days comes back to haunt him when a long-imprisoned killer claims Harry framed him and seems...

Back when Harry Bosch was just a rookie homicide detective, he had an inspiring mentor who taught him to take the work personally and light the fire of relentlessness for every case. Now that mentor, John Jack Thompson, is dead, but after his 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 brings the...