"In the aftermath of the Cold War, American intelligence caught three high-profiles Russian spies: Robert Hanssen, Aldrich Ames, and Edward Lee Howard. However, rumors have long swirled of another mole, one perhaps more damaging than all the others combined. Perhaps the greatest traitor in American history, perhaps a Russian ruse to tear the CIA apart, or perhaps nothing more than a bogeyman, he is often referred to as the Fourth Man. For the first...