Time to Kill by Brian Freemantle - 2006

In good condition - ex library - has markings from use - due to differing weights in books, postage maybe adjusted at checkout.

Jack Mason, once Russia's most successful CIA embedded traitor, has spent the last fifteen years in a penitentiary planning his vengeance on the Russian defector who exposed him.
Former KGB agent Dimitri Sobell has spent these fifteen years making a new and perfect life for himself in America. He's married Mason's ex-wife Ann, the woman for whom he defected from Russia's Washington embassy. And become the proud father of David. He has also acquired a new and permanent name, Daniel Slater. Until he gets an official letter advising him of the man's impending release, he'd virtually forgotten Jack Mason.
But Mason hasn't forgotten; he has trained himself to the peak of physical fitness. And become an expert computer hacker.
When these two brilliant intelligence professionals are pitted against each other in a private revenge-fuelled confrontation, only one outcome is possible...