Mystery writers apparently can't go wrong if they build their stories around serial killers. They can escalate murder by murder, making each one more disturbing. Sandford escalates well, but stretches the limits when he has the murderer kill his own mother. There is no real mystery here; we know the identity of the murderer in the first chapter. The only question is whether the police will find him before he kills again. The conversations among police officers are moderately amusing, but the good guy's significant other is more a token presence than a relevant character.