The Potomac Enigma

The President of the United States is abruptly awakened at 2:18 a.m., and summoned to his private study.
Three men are stoically awaiting his arrival. The president's first question is blunt and to the point. "What's up that required my presence at 2:30 am?" Sam Carstairs, one of the three men, is the top man in the White House Secret Service. He's an ordinary man in appearance—average in stature. That's where ordinary ended. He has been in the Secret Service for eighteen years, and his cred...