A bibliographic documentation of two key players whose traces can be found under the code name 'Rübezahl' from the Giant Mountains to Hiroshima. Robert Oppenheimer in America and Werner Heisenberg in Germany were rivals in the race for the first atomic bomb. The scientific foundations for the nuclear fission of uranium were laid by Otto Hahn, Lise Meitner, and Fritz Strassmann in 1938 in Berlin. A 'cunning fox' infiltrated the most secret US laboratory and betrayed the atomic secrets of Los Alamos to the Soviet Union. In 1941, a study titled 'On the Question of Initiating Nuclear Chain Reactions' was presented at the private institute of Manfred von Ardenne in Berlin. The atomic spy Klaus Fuchs, who went down in history, betrayed the Americans' atomic bomb secrets out of conviction. He last taught physics at the Technical University of Dresden and significantly influenced the nuclear military balance between the superpowers through his actions. In mid-August 1945, Manfred von Ardenne was personally commissioned by intelligence chief Marshal Beria in Moscow to collaborate on the Soviet atomic program. He too wanted to contribute to the balance of power. A mobile American counterintelligence unit pursued three main objectives on the European battlefield in February 1945: the arrest of leading German atomic researchers, the seizure of all documents and materials related to uranium research, and the dismantling or destruction of all apparatus and equipment. They aimed to secure their atomic bomb monopoly for all eternity. '1938 - A Secret Reich Matter: The Path to the German Atomic Bomb' reports on the impressive biographies of Manfred von Ardenne and Nobel Prize winner Otto Hahn, during a period when scientists from and in Germany contributed significantly to the advancement of natural sciences.