Lie Down with Lions by Ken Follett

Ellis, the American. Jean-Pierre, the Frenchman. They were two men on opposite sides of the cold war, with a woman torn between them. Together, they formed a triangle of passion and deception, racing from terrorist bombs in Paris to the violence and intrigue of Afghanistan - to the moment of truth and deadly decision for all of them...

"A deadly romantic triangle, a clandestine mission with global stakes, an exotic location, a plot as gripping and ingenious as Eye of the Needle ... engineered to perfection with breathless acceleration. I couldn't put it down!" - Los Angeles Times "Masterful... plot and counterplot, treachery, cunning and killing ... keep you on edge every moment" - Associated Press