Experience the true story that ignited the nuclear arms race. On the day Hiroshima was destroyed, physicist Alan Nunn May made a decision that would change the world, slipping a vial of uranium into a matchbox and handing it to a Soviet contact. Was he a traitor, or a man of principle fighting to prevent one nation from holding all the power? Journey through secret labs, shadowy meetings, and the dawn of the Cold War in this cinematic mini-documentary.