In December 2009, a group of the CIA's top terrorist hunters gathered at a secret base in Afghanistan to greet a rising superspy: Humam Khalil al-Balawi, a Jordanian who had infiltrated the upper ranks of al-Qaeda. For months, he had sent shocking revelations from inside the terrorist network and now promised to help the CIA assassinate Osama bin Laden's top deputy. Instead, as he stepped from his car, al-Balawi detonated a thirty-pound bomb, instantly killing seven CIA operatives and giving the agency its worst loss of life in decades. Now, with breathless momentum and rare inside access, Pulitzer-Prize winning reporter Joby Warrick takes us deep inside the CIA's war against al-Qaeda for an unforgettable portrait of both Humam Khalil al-Balawi and the veteran agents whose fierce desire to avenge 9/11 led to a terrible miscalculation.