"Joe was driving home when her dispatcher called. An arsonist had doused a local home with gasoline and lit it on fire. The homeowner escaped without injury, and the damage is minimal. It's a crime, but it's not a tragedy. Only the arsonist isn't done. He has ambitions and grievances and he doesn't care about houses. That was practice. His actual targets walk on two legs. Joe dives into the case and finds herself confronted by an adversary barely...