Two fellow soldiers, having lived a long and decent life, having died, turn out to be minds in the bodies of people at the beginning of the 17th century. They are forced to actively intervene in the course of events in order to save their new lives from death, and Russia - from the Troubles, the distant echoes of which have reached the present day. But even having met, friends cannot recognize each other, because now one of them is a teenage buffoon, in the second - a Russian tsar with a dubious right to the Moscow throne...