For 17 years, the Soviets knew every military move we made! That is how damaging the Walker family spy ring was to our national security. For the better part of two decades, John Walker, his son Michael, brother Arthur, and friend Jerry Whitworth comprised the KGB's greatest asset. Meticulously detailing the FBI investigation which finally broke the case, John Barron reveals how close the United States came to disaster - and how the repercussions may linger for decades.