The wealthy industrialist Alain de Narbois has disappeared. Michel Dunant, an idle man who passed by and who looks exactly like the deceased, is taken for Alain by a young woman and her servant. He jumps at the chance but quickly realizes that, in this hushed little world, masters and servants play comedy and know very well that he is only a double of Alain. In fact, the industrialist was assassinated.

Janvier, an embittered teacher, is fed up with his colorless, monotonous life. One day he breaks away and ends up becoming a circus clown. In his new world, he meets a beautiful acrobat nicknamed Lili and grows fonder and fonder of her every day of his life. The trouble is that the lady bestows her favors to two different lovers : wealthy married man Chardeuil and good-looking but listless young Antonio. He now considers his duty to make Lili recover her dignity.

Honorin is the simple and naive stage manager of a traveling theatre troupe, whose one ambition is to once play the role of the cavalier in the opera "Francis I, or the Loves of the Beautiful Ferroniere". A hypnotist puts him to sleep and in his dreams he is transplanted to the days of the Renaissance. There, among other items, he is made a Duke by Henri VIII, fights a duel and survives a series of medieval tortures, while also bestowing some 20th century blessings on the court of Francis I.