About the Soviet man, his honesty, intransigence with evil.

When the herdsman's son was born, the Great Ruler of the underworld, Erlik Khan, predicted to the newborn that he, having reached the age of seventeen, would be sacrificed to atone for human pride. But Mohammed — that's what his father called him — grew up kind and brave. The young man managed to force the Lord of Darkness to change his destiny.

A historical-revolutionary film based on real events in the small Kazakh settlement of Ridder, where news of the revolution in Petrograd arrives. A strike breaks out at the mines owned by a British joint-stock company.