The Potomac Enigma

The hypothetical question, "What if?" has been bandied about for years. The response—always the same. "Impossible, never, couldn't happen", or "too many checks in the system." No one could just take over The United States—or could they?
The murder of a junior senator and the investigation into that killing, by the top man in the U.S. Secret Service, becomes the pivotal point at which the mundane turns sinister. The "impossible" suddenly turns plausible. Clues, and the parties involved are as...