Coup de Chance is about the important role chance and luck play in our lives. Fanny (Lou de Laâge) and Jean (Melvil Poupaud) look like the ideal married couple -- they're both professionally accomplished, they live in a gorgeous apartment in an exclusive neighborhood of Paris, and they seem to be in love just as much as they were when they first met. But when Fanny accidentally bumps into Alain (Niels Schneider), a former high school classmate, she's swept off her feet. They soon see each other again and get closer and closer....