Over seven decades have passed since a city was destroyed by a nuclear weapon. But the danger never went away. We are now confronted with a world in which nine nations possess about 15,000 nuclear weapons. Many of the weapons in the American arsenal are roughly 20 times more powerful than the bomb detonated at Hiroshima. The Bomb places the viewer in the middle of the story of nuclear weapons, the most dangerous armaments ever built, from the Trinity Test in 1945 to the current state of nuclear weapons in 2017.