It was entered into the 7th Moscow International Film Festival where Ada Rogovtseva won the award for Best Actress.

In Europe, the World War has just ended and the winning countries are to organize a military intervention in Russia to help the White movement in the struggle against Soviet power.

The young underground fighter Maria gets the job to campaign among the Spanish sailors and soldiers.

After a long separation, Maria and Pablo meet again and together go to Spain as Comintern agents, to prepare a local revolution and at the same time to conduct intelligence activities there.

Having lost her husband and son, Maria returns home, where she works as an instructor in a Soviet intelligence school.