In the carefree days before World War I, introverted Austrian author Jules strikes up a friendship with the exuberant Frenchman Jim and both men fall for the impulsive and beautiful Catherine.
Gerard, a young man from a "good family" dreams of becoming an actor. To do this, he follows everywhere his sister Frédérique who is infatuated with cinéma vérité.
Joshua, in his thirties, has just learned that his file has been classified “child of X” : in other words, the identity of his parents remains unknown to this very day. He thereupon decides to designate his parents himself and sets out to “conquer” his unknown mother and father.
