In this electrifying #1 New York Times bestselling thriller from Tom Clancy, a silent war between the USA and Russia will decide the fate of the world—and Jack Ryan is behind enemy lines. Two men possess vital data 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 is the one American who can save CARDINAL and lead the world to the brink of peace...or war.