David Baldacci "The Camel Club"

In David Baldacci's thriller The Camel Club, four men meet every week in Washington, D.C. to discuss events of the day, and -- more enthusiastically -- the conspiracies they think are behind those events. But their discussions are academic, since the four members of the Camel Club are all misfits and rejects who have no real power. Or do they? The situation turns deadly when they witness the murder of a high-profile government official.