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April 12, 1945. After several years of bloody conflict in Europe and the Pacific, America is stunned by the news of the death of President Franklin Roosevelt. In an instant, Vice President Harry Truman, who was removed from war planning and knew nothing about the top-secret Manhattan Project to develop the world's first atomic bomb, must take command of a country fighting on several continents and make one of the most important decisions in history. Countdown tells the compelling story of the turbulent months, weeks, and days leading up to August 6, 1945, when Truman gives the order to drop the bomb on Hiroshima.