The Triple agent

In December 2009, a group of the CIA's top terrorist hunters gathered at a secret base in Khost, Afghanistan. They were meeting to greet Human Khalil al-Balawi, a Jordanian double agent who had infiltrated the upper ranks of al-Qaeda. For months he had passed on important information and now promised to lead operatives to Osama bin Laden. Instead, as he stepped from his car, he detonated a thiry-pound bomb strapped to his chest, instantly killing himself and seven CIA operatives, the agency's worst loss of life in decades.