In 1917, Bolshevik revolutionaries came to power in the war-torn Russian Empire in a way that defied all predictions, including their own. Scarcely a lifespan later, in 1991, the Soviet Union collapsed as accidentally as it arose. The decades between witnessed drama on an epic scale?the chaos and hope of revolution, famines and purges, hard-won victory in history’s most destructive war, and worldwide geopolitical conflict, all entwined around the dream of building a better society.