Based on

Movies like Madame Rex (1911)

Located in the south of France, a woman, who, after the death of her husband, is forced to assume the management of the Gambling Casino, of which he was proprietor. She places her daughter in a convent and keeps her in ignorance of her occupation. Twelve years later the mother becomes engaged to a young nobleman. The young man, however, by accident, meets the daughter, now seventeen years old, and falls in love with her, not knowing her identity. The mother realizing the truth of the situation, sacrifices her own love for the young man for her daughter's happiness.