A new lord takes power in Florence, a medicis without scope from the younger branch of the family. The boy, only 18 years old, does unanimity with the great Florentines only because he is unknown, docile, poor, without influence and without ambitions. Promised to a future of puppetry, the young Cosme will surprise his allies as his enemies in the exercise of power. Gradually revealing his true nature, showing himself to be belligerent, manipulative, ruthless, visionary and fine strategist, he seems capable of changing Tuscany forever. Can the boy in whom no one ever believed become the greatest Medici of his century?