Life in Gestapo jails in occupied Belgium.

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.

The story is a comedy about two dimwitted men from Brussels, Bossemans and Coppenolle. Much of the comedy comes from the fact that the characters all speak in the local Brussels dialect, which added to its popularity in Brussels and Wallonia. The plot broadly parodies Romeo & Juliet, with the contending families on opposite side of the contemporary Brussels football rivalry between Daring Club de Bruxelles and Union Saint-Gilloise.