On the proletarian solidarity of the French navy with the revolutionary people of Russia. The action takes place in the early years of Soviet power in the coastal city of Russia. The French cruiser Mirabeau threatens the city from the sea.

Construction of the Dnipro Hydroelectric Station began in 1927. The subsequent flooding of the Dnipro rapids forever changes the ancient way of life of farmers from coastal villages. However, the old maritime pilot Ostap Kovban is in no hurry to accept progress. Only his own son Andriy stands in his way.

In the Caucasus, among the picturesque mountains there is a guerrilla war between the Whites from Bicherakhov’s division and the Red Army soldiers. The Chechen girl Dzhalma finds an injured Ukrainian guy Mykola in a valley. She saves his life and helps him to recover. Young people fall in love with each other, and after the Bolshevik’s victory both of them travel to Ukraine. Dzhalma ends up in a traditional Ukrainian village.