The Manhattan Project began as a race against Nazi Germany and ended over a city its scientists had never intended to bomb. This film traces that arc from the secret laboratories at Los Alamos through the political and military arguments that settled on Hiroshima as a target, then slows down for the mission itself: the Enola Gay's flight, the crew's instructions, and the minute-by-minute sequence of the drop and detonation on the morning of August 6th. Archival footage, wartime photographs, and expert interviews reconstruct both the physics of the weapon and the human cost on the ground, from the blast's immediate destruction to the firestorms and radiation sickness that followed in the following days. The film also sits with the decision itself, laying out the case Truman's administration made for using the bomb against the case that it was unnecessary given Japan's weakening position. It closes on the bomb's aftermath: a war ended in days, and a nuclear age begun that has shaped every conflict since.