Lionel 'Buster' Crabb became renowned during the Second World War for his amazing feats of underwater daring. Then, in 1956, during a visit to Britain by Nikita Khrushchev, who had arrived by ship, Commander Crabb disappeared. Some thought he had perished while attempting to inspect the Soviet vessel; others that he had been kidnapped and forced to work for the USSR. The truth remains unknown to this day. It is the story of a man who has made deep personal sacrifices for the sake of higher ideals and who must, towards the end of his days, measure their meaning and their worth.