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On 6 August 1945, an atomic bomb was dropped on Hiroshima. In an instant, this event plunged the world into a new era - an era of weapons with such devastating power that nothing could stand against them. But this would never have happened without the will of the people who authorised, developed and prepared nuclear weapons for use. Journalists Chris Wallace and Mitch Weiss take a look behind the scenes of the bomb's creation, meet those who were involved in the story of the bomb in one way or another, and reveal their motivations, doubts, and moral conflicts.

This is the story of Julius Robert Oppenheimer and his team of scientists at Los Alamos, the newly appointed US President Harry Truman, the military pilot, Colonel Paul Tibbetts, and his men. However, it is also the story of a girl named Hideko Tamura from Hiroshima, whose life is about to change beyond recognition due to the emergence of a never-before-seen weapon.

This is the unknown story of mankind's greatest and most dangerous invention...