1957 film by Kurt Meisel

1955 film by Rudolf Schündler

1957 film by Ernst Marischka

1956 film by Günther Lüders

1956 film by Karl Anton

After the death of his Russian mother, nine-year-old orphan Peter lives with Professor Hartmann and his daughter Helga, who cares for him like a mother. Peter is very musical. He especially loves the melancholy songs of the Don Cossack Choir, which remind him of his mother. Because the boy has suffered from a severe heart defect since birth, his doctor, Dr. Stark, has forbidden him any excitement, including music. When one day the Don Cossack Choir's tour bus breaks down near Peter's house with engine trouble, the little boy meets the conductor Serge Jaroff and his famous singers in person.

Vera Kemp, heiress of an industrial enterprise, lives in an apparently perfect world. While she doesn't care for big business, her husband Manfred runs the company. However, she learns about his affair with a younger woman and tries to save her marriage. During a vacation in Italy, Manfred and their son Max die in a road accident. Vera nearly despairs of her grief and, even worse, recognizes that her whole life has been a lie. Andreas Wolgast, a former employee, is the only one who supports her fight for the company and against her caballing family...