The colorful Maria Bodin and her son Christian are over the moon: they have just been chosen by the Belgian royal family to organize a gala in honor of their 25th wedding anniversary. The gala will be held at the Royal Palace in front of the royal family themselves. Unfamiliar with the workings of the Belgian monarchy, mother and son will have to learn the ropes, get organized, and prepare to join the aristocratic ranks.

Doctor Knock is a former thug who has become a doctor and arrives in the small village of Saint-Maurice to make his fortune according to a particular method. It will make the villagers believe that they are not as healthy as they might think. It is thus that he will find in each one an imaginary symptom, or not, and thus will be able to exercise his profession lucratively. Under his seductive looks and after gaining the confidence of the village, Knock is on the verge of achieving his ends. But his past catches up with him and an old acquaintance disrupts the doctor's plans.

Nous sommes dans un coin de France reculé... très reculé.