Book excerpt: When a local Philadelphia radio host known for his incendiary right-wing tirades is arrested for possession of illegal prescription drugs, the incident sets into motion a series of events that leads ultimately to the death of a homeless man. In the complicated mix is the local Benedictine monastery, a Nobel-prize-winning leftist academic, and a homeless advocacy group, among others. Now Gregor Demarkian, a retired F.B.I. agent, is hired by a local legal project to look into the circumstances surrounding the death of their former client--a task that leads Demarkian through a mirror-maze of motives and actors as he struggles to unravel a most complex puzzle before the killer strikes again.