Jessica is a beautiful and naive girl from the south-east of France. She is extremely close to her grandmother who continuously repeats the same story: when she was young she managed to move up in the world while working as a cleaning lady in a popular luxury hotel in Paris. One day, Jessica decides to go to Paris and finds a job at a cafe frequented by the "tout Paris". Indeed, it is located on Avenue Montaigne, in the wealthy section of Paris. Her customers include an array of artistic figures. A famous soap-opera actress, Catherine Versen, tries to seduce a major Hollywood director, Sobinski, in the hope of getting the part that she believes will radically change her carreer. Jacques Grunberg, an art lover, is about to sell a lifetime's worth of artworks at an auction. Jean-François Lefort, an illustrious classical pianist, is in the midst of a career crisis and refuses to play in the posh concert halls that have invited him. A social and financial gap separates Jessica from each of the others, but her innocence compensates for all the differences and serves to create a rewarding and profound link between the waitress and her clients.