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Mug shots of Otto Kuehn, taken at the maximum security federal penitentiary in Leavenworth, where he began serving a 50-year sentence for espionage in 1942. From "Family of Spies"/Celadon Books

COVER STORY: "Family of Spies": Christine Kuehn discovers her grandfather's Nazi past

In 1994 Christine Kuehn received a letter that revealed a family history from which her father had tried to shield her: Christine's grandfather, Otto, was a Nazi spy who was the only person tried and convicted for the bombing of Pearl Harbor. David Martin talks with Kuehn about he

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