From the project of a hunting lodge imagined by the young Francis I to the masterpiece designed by an aging Leonardo da Vinci and started by the tried sovereign, a captivating investigation into the Chambord enigma. Unrivaled, Chambord, the most famous château in the Loire, remains an enigma that historians, researchers and architects have been pondering for generations. Imagined by the young King Francis I, who loved hunting and chivalry, this "book of stone" continues to arouse perplexity five centuries after its construction, especially since no plan of the initial project has been found. Why did the sovereign, at the height of his glory, undertake this titanic project in the middle of the marshes in 1519? Who was the architect? And how was this work of genius with its magical appearance developed?