"If your opponent has only two possible options, you can be sure that he will take the third." A tough, resourceful master of his trade, British Intelligence agent Nick Stone has just been given a chilling ultimatum: find a missing agent who appears to have defected or lose the guardianship of his beloved nine-year-old daughter. In Stone's mind, there is no choice.

The "runner" is Sarah Greenwood, U.K. liaison with the Counterterrorism Center, a cell set up by the CIA to warn against potential terrorist attacks. Steel-willed, beautiful, cunning, Sarah is also Nick's former lover, the only woman who has ever been allowed under his rough, impenetrable guard.

"It's not only what you see. Sometimes what isn't there is just as important as what is." Relying on his keen instincts and cool logic, Nick tracks Sarah to the mountainous backwoods of North Carolina. There, in a remote cabin, she conspires with two Middle Eastern men. Then Nick's mission takes a decidedly dark turn when he receives a T104--an order to kill Sarah without a trace.

But nothing is what it seems, as Nick and Sarah themselves become hunted, racing deeper into a dark, deadly conspiracy that will change the course of world events--and the lives of millions.

With seventeen years of active service in the elite SAS force, Andy McNab writes from his own harrowing experiences. As compelling and relentless as a fast-burning fuse, Crisis Four hurtles us into a breathtaking plot of nonstop action and suspense. Packed with authentic procedural details, it is a thriller so gritty and real that you won't know where fact ends and fiction begins.