Two men possess vital information on Russia's Star Wars missile defense system.

One of them is CARDINAL -- America's highest agent in the Kremlin -- and he's about to be terminated by the KGB.

The other one is the American who can save CARDINAL and lead the world to the brink of peace . . . or war.

Here is author Tom Clancy's heart-stopping masterpiece -- a riveting novel about one of the most intriguing issues of our time.