1245. The great steppe burns in the fire of internecine war. Batu is trying to put his khan on the throne of the Mongol Empire, and Grand Duke Yaroslav will soon be poisoned in Karakoram. A great turmoil is coming, where his brother will again go to his brother, without hesitating to bring countless hordes of Nevryuy to Russia. How will a history teacher from the 21st century, who stood at the head of a little-known town abandoned in the forests, behave and what will he do in these conditions?!