The prince of the yoke, Grunlaf, having concluded an alliance with the leaders of other Borean tribes, goes on a campaign to Sinegorye. The black magician Krasus, striving for the triumph of the evil principle in people, alternately supports either Grunlaf or Vladigor. His main goal is to make them blind instruments of his will. For some time he succeeds. Blood is flowing, the capitals of both warring states are burning...