There is no more serious issue in the United States today than the methods through which our military can prevent another September 11th. The front line of the war on terror has become the interrogation room, where prisoners are pressed for reliable information - the big plots and the small details that, when pieced together, could form our strongest defense. Larry talks with Greg Miller and Chris Mackey, co-authors of a book called The Interrogators: Inside the Secret War Against Al Qaeda (Little, Brown & Co). Miller was the only journalist given access to US Army interrogators, learning about exactly what goes on behind the closed prison doors, where face-to-face psychological warfare is waged.