The Marching Season (Michael Osbourne, #2)

When the Good Friday peace accords are shattered by 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 CIA agent Michael Osbourne is drawn back into the game.

He soon discovers that his father-in-law is marked for execution. And that he himself is once again in the crosshairs of a killer known as October, one of the most merciless assassins the world has ever known...