 
General Charles Ferguson, Commander of the British Prime Minister's  private hit squad and adviser to the new president of the United  States, has been given a disturbing recording from Afghanistan, on  which the murders of American Army Rangers and a British medical team  are recorded. About half of the Taliban force voices on the tape are  British. One authoritative voice is Irish; code name: Shamrock.
Shocked that one of their own could be responsible for a massacre,  General Ferguson tasks Sean Dillon with hunting the traitor. But even  as Dillon goes to war, the war is coming to him...