On All Hallow’s Eve in 1517, a young monk named Martin Luther posted a document he hoped would spark an academic debate, but that instead ignited a conflagration that would forever destroy the world he knew. Five hundred years after Luther’s now famous Ninety-five Theses appeared, Eric Metaxas, acclaimed biographer of the bestselling and , paints a startling portrait of the wild figure whose adamantine faith cracked the edifice of Western Christendom and dragged medieval Europe into the future. Written in riveting prose and impeccably researched, tells the searing tale of a humble man who, by bringing ugly truths to the highest seats of power, caused the explosion whose sound is still ringing in our ears. Luther’s monumental faith and courage gave birth to the ideals of liberty, equality, and individualism that today lie at the heart of all modern life.