To his friends and neighbors, Glenn L. Carle was a wholesome, stereotypical New England Yankee, a former athlete struggling against incipient middle age, someone always with his nose in an abstruse book. But for two decades Carle broke laws, stole, and lied on a daily basis about nearly everything. "I was almost never who I said I was, or did what I claimed to be doing." He was a CIA spy. He thrived in an environment of duplicity and ambiguity, flourishing in the gray areas of policy. The Interrogator is the story of Carle's most serious assignment, when he was "surged" to become an interrogator in the U.S. Global War on Terror to interrogate a top level detainee at one of the CIA's notorious black sites overseas. It tells of his encounter with one of the most senior al-Qa'ida detainees the U.S. captured after 9/11, a "ghost detainee" who, the CIA believed, might hold the key to finding Osama bin Ladin. As Carle's interrogation sessions progressed though, he began to seriously doubt the operation. Was this man, kidnapped in the Middle East, really the senior al-Qa'ida official the CIA believed he was? Headquarters viewed Carle's misgivings as naive troublemaking. Carle found himself isolated, progressively at odds with his institution and his orders. He struggled over how far to push the interrogation, wrestling with whether his actions constituted torture, and with what defined his real duty to his country. Then, in a dramatic twist, headquarters spirited the detainee and Carle to the CIA's harshest interrogation facility, a place of darkness and fear, which even CIA officers only dared mention in whispers. A haunting tale of sadness, confusion, and determination, The Interrogator is a shocking and intimate look at the world of espionage. It leads the reader through the underworld of the Global War on Terror, asking us to consider the professional and personal challenges faced by an intelligence officer during a time of war, and the unimaginable ways in which war alters our institutions and American society. Glenn L. Carle was a member of the CIA's Clandestine Service for twenty-three years and retired in March 2007 as deputy national intelligence officer for transnational threats. He lives in Washington, DC.