Marguerite Gautier has died. The contents of her luxurious apartment are to be disposed of by auction. Nanina, her faithful servant, takes leave of the familiar apartment for the last time. Curious visitors, buyers, acquaintances and friends of the deceased enter, among them the older Monsieur Duval, to examine the appointments. A young man - Armand Duval - rushes desparately into the room: He collapses. Duval recognizes his son and lovingly supports him. Overcome by memories Armand begins to tell his story.