The Prometheus Deception Mass Market by Robert Ludlum

The ultimate spy. After fifteen years as a brilliant master spy, Nick Bryson has disappeared into anonymity as a professor at an exclusive college in western Pennsylvania-- until he's suddenly lured back into the game.

The ultimate threat. Recruited by the CIA, he's been commissioned to track the moves of the Directorate. Once, the ultra-secret intelligence agency was Bryson's training ground. Now it's a multinational terrorist conspiracy bent on global domination.

The ultimate deception. But to eliminate the core of corruption means plunging into his own past, investigating the motives of a beautiful stranger who may be his greatest downfall, and infiltrating a secret nexus of power called Prometheus that holds the terrifying clues to his past-- and the even more terrifying possibilities of the future...