Rainbow Six by Tom Clancy

Newly named head of an elite multinational task force, John Clark faces the world's greatest fear: international terrorism. And following each terrifying new outbreak - the ghosts from his own past.

The challenge of a new mission is just what Clark needs, but the opportunities come faster than he expected. Hostage-taking at a Swiss bank. The kidnapping of an international trader. Carnage at a theme park in Spain. Each incident seems separate, yet the timing disturbs Clark.

Is there a connection? Is he being tested? Or is there a bigger threat out there, from terrorists so extreme that no government is ready to admit their existence.