At 8:15 a.m. on August 6th, 1945, the Japanese port city of Hiroshima was struck by the world's first atomic bomb. Built in the US by the top-secret Manhattan Project and delivered by a B-29 Superfortress, a revolutionary long-range bomber, the weapon destroyed large swaths of the city, instantly killing tens of thousands. The world would never be the same again. This book's unique narrative recounts the decade-long journey towards this first atomic attack. It charts the race for nuclear technology before, and during the Second World War, as the allies fought the axis powers in Europe, North Africa, China, and across the vastness of the Pacific, and is seen through the experiences of several key characters, including General Leslie Groves, Colonel Paul Tibbetts II, Senkichi Awaya, and John Hersey.