A disturbing tape has made its way to British intelligence, and from them to the new President of the United States: battlefield chatter from an ambush in Afghanistan, in which twelve U.S. Army Rangers and a British medical team died.
Most of the Taliban voices are Afghan, but not all of them - the voice of the commander bears an Irish accent. The idea that one of their own could be responsible for such a massacre is appalling, and Sean Dillon is put in charge of hunting the traitor down. But Dillon has his own way of doing things and so, he will eventually discover, does his quarry. Dillon will not only be going to war - the war will be coming to him.
The fast and furious plot sweeps the reader from Pakistan to Algeria to London to Paris to Ireland, with many deaths along the way. And one familiar, and deadly face from The Wolf at the Door makes a dramatic, and decisive reappearance, in a nerve-jangling story, where the stakes are high, and no one can be trusted.