J. F. being the incomprehensible, elusive flaw which could keep a weapon--like an atomic bomb--from working. Senator Paul McGavin, determined to buck President Foster's game of nuclear footsie, travels to Britain, France and Israel, where leaders hint that there is more to an atomic bomb than blinds the eye, and to Russia where he is treated to an ancient film in which Truman announced that our bomb didn't work anyway. Research in Japan, flashbacks to his own 1945 experience of unloading the Bomb over Tokyo, close calls with death, bring him back to Foster who levels--about the worthlessness of the bomb, a secret kept in Jesus Project files since World War II, and the salutary game of bluff which kept a balance of power. More successful than Siege (1969), which dealt with less fantastic, more human realities, this is an airborne suspense thriller--nothing more or less--although Harry may give it hell.