Life could be so sweet for Gus Vermeulen and Achille Mironval. They are partners in a cheese trade and business is good. So what they plan to do is to marry their two children so as to perpetuate this blissful situation. However two annoying facts cast a shadow over their happiness. Jean-Pierre Mironval, Achille's son, won't hear of anything connected with cheese and would rather be a jazz band leader and Gus, with his passion for spiritism, sows the seeds of discord between the two men. But all is well that ends well.

Pouske runs the "Le Bienvenu" café with his wife Antoinette and daughter Jeanne. On the market square, the fairgrounds are setting up their rides and the neighborhood is getting ready to party. But Jeanne is about to fall in love with a sweetheart who has come from who knows where to cause trouble.