The dying teenager Dmitry, the son of the appanage prince Yuri Dmitrievich of Zvenigorod and Galitsky, receives the memory of our contemporary and recovers. But not all those close to the father are happy about the recovery of the heir. At this time, a deadly confrontation is brewing between the father of Prince Dmitry and the clique of boyars of Princess Sophia, who wrongfully placed her son, the young Vasily, on the throne of the Grand Duchy of Moscow. Not only the interests of the authorities are at stake, but also the very existence of Rus'. After all, behind the back of the ruler Sophia stands her powerful father - the ruler of Lithuania, Vytautas.