A son comes to Leningrad on the birthday of his mother. He is the director of a large Siberian construction, twice married, happy in work, and in family life. His second wife Lida is also here. She brought her son and daughter with her. The youth of the mother of the family fell on the 30s. Life practically did not change its principles and beliefs. And it's not clear to her children, and even more so grandchildren, for whom her ideals do not mean anything.