The elegant widow Hélène (Edith Scob) lives alone with her faithful housekeeper in the cherished family home – a rambling country property outside of Paris. For her seventieth birthday, all her children and grandchildren come for a brief visit. Emphasizing their perpetual absence, they give her a portable telephone the mechanics of which baffle her. “You must set it up for me, before you go.”Hélène takes aside her eldest, Frédéric (Charles Berling) to explain her wishes for the estate, pointing out the most valuable art objects and emphasizing that the family should not feel tied to the old and costly house. Frédéric doesn’t want to listen; she is too young, he claims. He loves the house and assures her that the family will keep it. Moments later, the families pile into cars and race off. With the new phone still unconnected, Hélène is alone again, smoking in the evening gloom. Six months later, they gather once more for Hélène’s funeral. Single and living in the United States, Adrienne (Juliette Binoche) is sulky and rootless. Jérémie (Jérémie Renier) is entrepreneurial and is planning to live in Asia. Neither want to keep the house, and both could use the money from its sale. Frédéric is shattered by their indifference to the family and its traditions, but he cannot afford to buy them out. His wife sympathizes and waits. He loses the negotiatons. Yet, being the eldest and the only sib in France, he is forced to preside over the sale and dismantling of the property he loves.
Grégoire Ponceludon de Malavoy (Charles Berling) travels to the court of Louis XVI at Versailles seeking support for his plan to drain a marsh in order to relieve his poverty-stricken community from the scourge of malarial fever. Naive in the ways of court, he is robbed and left on the road for dead. A kindly doctor and would-be courtier (Bernard Girardeau) finds Grégoire and nurses him back to health with the help of his beautiful and highly intelligent daughter, Mathilde (Judith Godréche).
Grégoire accompanies the doctor to court where he quickly excels in the fine arts of repartee, ridicule, and sang-froid. Seeing this practice as a route to the king, Grégoire plays the game well and begins to have fun, in spite of himself. He attracts the attention of the influential Comtesse de Blayac (Fanny Ardent) with whom he sleeps, despite his love for Mathilde.
A peasant child's death at home inflames his obsession over the marsh. At the moment he is finally about to have the king's attention, he duels with an officer over a matter of honor; he wins the duel but loses his regal audience for having shot a royal soldier. The film ends in the Revolution: Grégoire and Mathilde are well launched in their drainage project and the doctor is an émigré on the English coast learning the fine arts of British humor.
