In January 2002, As U.S. Forces in Afghanistan were hunting down Al Qaeda suspects, the CBS news show 60 Minutes II got its hands on some sensational footage: seven hours’ worth of videotape showing Al Qaeda terrorists training in an Afghan camp. The source of the tapes, a former U.S. Special Forces soldier named Jonathan Keith Idema—known familiarly as Keith—was more than a little dubious. Idema claimed to be working as an adviser to the Northern Alliance, but he was also an ex-con who had served three years in federal prison for wire fraud and had a criminal record in...