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.