About the book: 2023 / Afghanistan. The end of the war between Soviet troops and the Mujahideen. Special forces are establishing order in the Kunar province adjacent to Pakistan. While chasing the Stingers, Kondraty Lvovich Zarubin, a hereditary Cossack and a special forces captain, falls into a trap. After an explosion in a dugout filled with explosives, his spirit is transported to the past. Waking up, he discovers that he is now living in someone else's body. Here he is called Evpatiy Kolovrat. He is a boyar and military leader who serves the Ryazan prince Yuri. The year is 1235 AD. There are still a couple of years left before Batu’s invasion, during which Rus' will tremble, and Ryazan will be the first to be burned. And now the army of Khan Batu set up camp on Voronezh. Trouble is brewing along the borders of the principality, and in Ryazan itself there is growing confusion. No one knows when the invasion will begin, but the threat hanging over Ryazan does not frighten the rest of the princes of Rus', who are usually busy with their feuds. Everyone is waiting. And only a governor from the twentieth century, who has already taken many secret steps to strengthen the city, is sure that without help Ryazan is still doomed. By chance, Kolovrat falls into the hands of an ancient secret that can change the course of history. There is hope for a doomed city.