Before this book, no one had written the truth about the German atomic program. There were only some rumors, to the point that the United States dropped a German atomic bomb on Hiroshima on August 6, 1945. The explanation for this is very simple - the Allied reconnaissance mission cleared the liberated territory of Europe and took out everything: documents, people, uranium-235, etc. David Irving, 20 years after these events, found all the German documents on Hitler's atomic bomb abandoned in the warehouse of the US Commission on atomic energy. He was assisted in writing this book by Werner Heisenberg, a Nobel laureate and scientific director of the German nuclear program.