After the death of her husband, Tamara gave her daughter Olya to an orphanage and left for the North. There she creates a new family and, years later, calls the matured girl back. Not finding love in her mother's house, Olga left for a Siberian construction site with the plumber Roman. But the first difficulties frightened him, and he left her, never knowing that Olga was expecting a child. She remains to live with a relative on the collective farm. A few years later, Roman appears and becomes attached to the boy, not suspecting that this is his son.