Nathalie teaches philosophy at a high school in Paris. She is passionate about her job and particularly enjoys passing on the pleasure of thinking. Married with two children, she divides her time between her family, former students and her very possessive mother. One day, Nathalie’s husband announces he is leaving her for another woman. With freedom thrust upon her, Nathalie must reinvent her life.

Mathias Gold is a down-on-his-luck New Yorker who inherits a Parisian apartment from his estranged father. But when he arrives in France to sell the vast domicile, he's shocked to discover a live-in tenant who is not prepared to budge. His apartment is a viager—an ancient French real estate system with complex rules pertaining to its resale—and the feisty Englishwoman Mathilde Girard, who has lived in the apartment with her daughter Chloé for many years, can by contract collect monthly payments from Mathias until her death.