It’s been three years since Genghis Khan died, but his legacy lives on. The Khan's banner was taken into his hands by the son of the great conqueror Ogedei. As a sign of his power, he built the white city of Karakorum - the capital of the new empire. A huge silver tree - a symbol of prosperity and power - was installed by Ogedei at the entrance to his palace. But it is unusual for his dashing warriors to live in peace for so long, without military campaigns. And he sent a huge army led by the best military leader far to the west, to the last sea. Having conquered half the continent, the Mongolian tumens victoriously reached the borders of France and Italy. It seems that no one and nothing can hold them back. And then an event occurs that radically changes the fate of the silver empire - and the entire world history.