Isolated in the mountains of Mourne, far from the lonely Ulster crossroads where it all began, a deadly final reckoning is in the making. Charles Garrett, lethal executive arm of the British government organization PACT, wants revenge on the IRA assassin who mowed down his wife in a hail of bullets. Lured into a trap by a series of brutal assassinations of MI5 couriers, Garrett discovers that the ultimate enemy is within.