Meret Voytek, pupil of professor Viktor Rosen, a Jew in exile from Germany, watches as Vienna comes under Nazi rule and the repercussions for the Jews. Across Europe, Dr Karel Szabo, a Hungarian physicist, has been interned on the Isle of Man. Rescued by the Americans, they recruit him in building an atomic bomb. Moving from Vienna and Auschwitz to the deserts of New Mexico to London, fate carries the enemy alien, Szabo and gentile Voytek, across the battlefields of the destructive war.