Connelly has his now retired LAPD detective, Bosch, working on a volunteer basis on cold cases. He has placed Bosch in 3 different situations in this novel in which Bosch successfully solves a murder involving sale of illicit drugs, a cold case disappearance, and an accusation of evidence tampering from a death row inmate. The longer plot is the one dealing with the sale of illicit drugs in which Connelly lengthily describes the actions of how the pills are bought and distributed. That plot is the more exciting one to read about as Bosch goes undercover and has some adventures posing as a drug addict. The other 2 minor plots are solved within a chapter.One plot features court detail/dialogue so not that interesting, but does show how lawyers get results based on innuendo. A mildly interesting read.