It was an enigma of the Vietnam War: American troops kept killing the Viet Cong--and were being killed in the process--and yet the Viet Cong's ranks continued to grow in size. When one man, CIA analyst Sam Adams, uncovered documents suggesting a Viet Cong army more than twice as numerous as previously reckoned, another war erupted, this time within the ranks of America's intelligence community. This clandestine conflict, which burst into public view during the acrimonious lawsuit