Madame de Lanssay, a ruined noblewoman, has become the lady's companion of Anne Guéric, a woman who suffers from a nervous illness. She has a daughter, the comely Gabrielle, that she plans secretly to marry to a rich man, and why not to Robert Dharmon, Madame Guéric's nephew? But Robert is in love with Eddie Rochefort, the daughter of a rich widowed banker. However, due to certain circumstances, the young man lets himself be seduced by the siren. Fortunately he comes back to his senses when he becomes aware of the intrigues of the two women. He energetically repels Gabrielle's advances and marries Eddie. But the gold digger has not said her last word...