In 1517, a young monk named Martin Luther posted a document he hoped would spark an academic debate, but instead ignited a conflagration that would forever destroy the world he knew. 500 years after Luther's famous 95 Theses, acclaimed biographer Metaxas paints a startling portrait of the figure whose faith cracked the edifice of Western Christendom and dragged Medieval Europe into the future. In time for the 500th anniversary of the Reformation.