At the awful dawn of a nuclear age—at the painful birth of the Cold War—the Citadel was constructed in secret beneath the Antarctic ice. Housing the most devastating weapon imaginable, it was a safeguard against an unseen threat far more potent than the growing Communist menace. Now, six decades later, America's destruction seems all but assured—because the enemy has re-emerged from the shadows of time.

And the Citadel has been breached.

The commander of Section 8—a covert force of misfits assigned the impossible missions no one else will touch—Captain Jim Vaughn must now lead his unit into the unknown to diffuse a nightmare of astronomical proportions. The future hangs in the balance—and the ultimate survival of humankind is in the hands of men with nothing left to lose . . .