the messy wars of occupation and has been championed as a clean and surgical way of conflict. But the knife has created enemies just as it has killed them. It has fomented resentments among allies, fueled instability, and created new weapons unbound by the normal rules of accountability during wartime. Mark Mazzetti tracks an astonishing cast of characters on the ground in the shadow war, from a CIA officer dropped into the tribal areas to learn the hard way how the spy games in Pakistan are played to the chain-smoking Pentagon official running an off-the-books spy operation, from a Virginia socialite whom the Pentagon hired to gather intelligence about militants in Somalia to a CIA contractor imprisoned in Lahore after going off the leash. At the heart of the book is the story of two proud and rival entities, the CIA and the American military, elbowing each other for supremacy. Sometimes, as with the raid that killed Osama bin Laden, their efforts have been perfectly coordinated. Other times, including the failed operations disclosed here for the first time, they have not. For better or worse, their struggles will define American national security in the years to come.