Louis Mennechain is a modest locksmith. So imagine his amazement when Professor Piétrefond approaches him and tells him he recognizes in him a descendant of the kings of France, more precisely of Louis XVII (the king who never reigned). According to him he is none other than the monarch's great grandson. Louis's life is soon turned upside down as he becomes the center of attention of a group of ardent royalists. Even a duchess "gives" him her love to make sure that he accepts his role as pretender to the throne...
A provincial ingenue leaves her mother’s tobacco shop with dreams of a life in the Parisian theater, only to become entangled in relationships with a lecherous aristocrat, his starry-eyed nephew, and an old ham actor.
During the Second World War, Georges Masse undergoes a dangerous mission by taking secret documents from Tangiers to London.
