So begins Army interrogator Tony Lagouranis's first briefing at Abu Ghraib. When the U.S. went to war with Iraq, Lagouranis-who joined the Army prior to September 11-was tapped to be an interrogator in places like Abu Ghraib and Fallujah. He believed in his mission, but he soon discovered that pushing the legal limits of interrogation was encouraged. Under orders, he-along with numerous other soldiers-abused and terrorized hundreds of prisoners by adding "enhancements" to "Fear Up Harsh," an official tactic designed to terrify prisoners into revealing information. This is an unflinching first-hand account of how one man struggled with his own conscience and ultimately broke the silence surrounding interrogation practices. The first Army interrogator to step forward and publicly denounce these tactics, Lagouranis reveals what went on in Iraqi prisons-raising crucial questions about American conduct abroad.

Tony Lagouranis has appeared on Democracy Now, the PBS Frontline documentary "The Torture Question," and MSNBC's Hardball. He lives in Chicago, Illinois.

Allen Mikaelian is a doctoral fellow in history at American University and author of the New York Times bestseller Medal of Honor.