The Marching Season — Daniel Silva

When a new Protestant extremist group shatters the Good Friday peace accords with three savage acts of terrorism, Northern Ireland is blown back into the depths of conflict. And after his father-in-law is nominated to become the new American ambassador to London, retired officer Michael Osbourne is drawn back into the CIA.

Then Osbourne uncovers a dark plan that marks his father-in-law for execution, setting into motion a deadly chain of events that will thrust him back into the sights of the most merciless assassin the world has ever known. Osbourne escaped this ruthless killing machine once--but the elusive October will never allow him to slip through his crosshairs again. . . .