Fourth century of the Age of Migration. In the Eridanus system, inhabited by earthling colonists and very rich in terrestrial planets, a brutal civil war is raging. An Orthodox empire copying the way of life of the Romanov empire, adapted to new conditions. faced a life-or-death struggle with the Eridani Union, which is trying to once again build a society based on Marxist principles. Suddenly, a third force intervenes in the brutal civil strife of the Eridani people... Will the ideological antagonists be able to unite and repel the enemy? Will they save the main treasure taken from Earth?