Paris, 1875. The meeting between Alfred Nobel, a wealthy Swedish inventor of dynamite, and Bertha von Suttner, an emancipated Austrian pacifist, sparks an unexpected story preserved in twenty years of correspondence and culminating in the Nobel Peace Prize. This documentary traces their intertwined lives through letters, archives, historian testimonies, and dramatized scenes, set against the Industrial Revolution and the looming threat of war, revealing two contrasting figures and the history they shape together.