This call will be heard only by a select few - those in whose veins the blood of ancient heroes flows. But it also sounds in the hearts of wolves running across the endless snow-covered tundra to where the sounds of the horn call them. This is the trumpet of the god of war... Eight-year-old Slavik Kalachev is lonely, but fate has sent him a gift - a magical green stone. And it doesn’t matter that the mother considers the magic emerald to be a piece of simple glass - the boy believes that soon he will meet a true friend and his life will change. Meanwhile, around adults, they are playing among themselves, not a child’s game. In their hands are modern weapons, the latest achievements of science and technology and the secrets of ancient witchcraft. They are strength and power. They are death and suffering. They believe that everything is under their control; they are confident that they will be able, by taking off their hats to the omnipotence of Light, to force the forces of Darkness to serve them.