Caught by tabloid paparazzi with his mistress Elena, a famous and beautiful fashion model, billionaire Pierre Levasseur tries to avoid a divorce by inventing a preposterous lie. He uses the presence of a passerby in the photo to claim to his wife that it's not him Elena is seeing but the other man, one François Pignon. Pignon is a modest little man who works as a parking valet. To make the story convincing, Elena has to move in with Pignon.

François, an ordinary Joe, falls hard for the sublimely beautiful woman who has just picked him up on the train and invited him to spend the weekend with her on the Riviera. But when the lady disappears the next morning and the police drag him in for questioning, François discovers he's been set up to pass for her notorious outlaw husband on the run, Anthony Zimmer. Even though he's been lied to and manipulated, François' life is changed forever and he's ready to give anything - maybe even his life - to hold this mysterious beauty in his arms again.