Deep beneath the Kremlin's ancient walls, did Ivan the Terrible hide one of history's most priceless treasures? Not a hoard of gold, but a legendary collection of lost knowledge from the ancient world. This episode, we descend into the vaulted chambers of rumor and history to ask: is the fabled library a mere fantasy, or does it still lie buried under modern Moscow? We journey to the dead of a 16th-century Moscow winter, into the private chambers of the contradictory Tsar himself—a man both pious and brutal, a patron of culture who ruled through terror. The legend claims he possessed piles of ancient manuscripts and scrolls from Constantinople, containing philosophy, science, and history thought vanished forever. From the moment this collection was supposedly sealed, it disappeared from all records, sparking a mystery that has endured for centuries ...