A simple guy, Styopa, without suspecting it, brought with his car to a small town a gang of gangsters looking for a unique diamond.

Somehow, three came to these lands to the camp of ataman Sidor. One of them recently escaped from Turkish captivity, where from the centurion dying on his hands, he learned about a chest hidden in these places with the Ryazan treasury. The Cossacks, having conferred, decide to go in search of her, but the Turks are already looking for the treasury, who once hid her here.