This is another excellent entry in Michael Connelly's series featuring LAPD homicide detective, Harry Bosch.

Bosch, who had earlier retired from the department is now back under the Deferred Retirement Option Plan (DROP). He has a little more than three years left before he will be forced to retire for good and he is anxious to accomplish as much as he possibly can in the time he has remaining.

Harry is now working in the Open/Unsolved Unit, investigating cold cases, and as the book opens, he and his partner, David Chu, are assigned a particularly interesting case from over twenty years earlier. A child was sexually assaulted and murdered and now DNA evidence has linked the crime to a convicted sex offender. It seems like an open and shut case, except for one small problem: at the time of the crime, the offender whose DNA was found on the body was only eight years old.

While Harry pursues this puzzling cold case, he's assigned to a new live case by special request. The son of an old nemesis, city councilman Irvin Irving, has dropped to his death from a balcony at a posh hotel. The councilman insists that Bosch investigate the death personally. While he and Harry may have at times been bitter opponents, Irving knows that Harry is a man of integrity and that he will find the real truth, irrespective of whether the son's death was an accident, suicide or murder.

Inevitably, Harry will face any number of obstacles in both investigations and in the end, he has to wonder whom, if anyone, he can trust. Both cases are very interesting and as always, it's enormous fun to watch Harry work. Michael Connelly, like his fictional detective, seems to just be getting better and better with age. This is a real page-turner that should appeal to anyone who enjoys crime fiction and that will be treasured by fans of this great series.