Cheater

Cheater is the story of Henry Culver, a surveillance expert who retired from the CIA when his technical skills were used as a front for an assassination. Disgusted and demoralized, Culver seeks other uses for his skills and finds himself employed as a police officer in Fairfax, Virginia - a suburb just outside Washington, D.C. - helping to hunt down a psychopath called "John Doe Thirty-three."
The clues are minimal: The sadistic killer goes after his victims through the crawl spaces of their homes...cutting a secret entrance in the floor...installing small hinges...razor-cutting through the carpeting...and then waiting for his victims like a trap-door spider.
But what Henry Culver doesn't know is that John Doe Thirty-three, a.k.a. "Digger," is also a surveillance agent for a rogue faction of the CIA that intends to permanently alter the balance of power in the agency - and in the world. He doesn't know if his old supervisor in the CIA can still be trusted. He doesn't know why a French Interpol officer is suddenly very interested in his welfare. And he doesn't know if one of his childhood friends - and now a fellow police investigator - is really working with Digger on a hidden agenda of their own.
In short, Henry Culver doesn't know just how much danger he's really in....

Ken Goddard is currently the director of the National Fish and Wildlife Forensics Laboratory.