Air Force Maj. Don Stewart is a kind of fish-out-of-water hero. He and his family are moving to Tokyo, Japan, to work for the U.S. Embassy - but Stewart gets wrapped up in terrorists, nuclear bombs and culture clashes all at the same time.
It seems that Japanese extremists (led by a eerie sumo wrestler) don't like Americans in Japan. And it seems that in this story, they have an ace up their sleeve.
Way back in 1945 when the U.S. and Japan were fighting in the last of WWII, the first atomic bomb dropped in Japan didn't go off - thus giving the terrorists 50 years later their nucleus of a plan: find the old bomb and make more bombs. Of course, the Air Force major gets involved.