 A small European Kingdom wants to make a frowning Princess smile for the upcoming Royal photo to be done. A mischevious Prime Minister (Louis de Funes) goes to Paris to kidnap three famous comics (including Henri Salvador and Annie Cordy) to force them to do an act to make the Princess smile. However, the King is not aware of this scheme... especially that this evil minister has to face a "fasting strike" by the prisoners and force them to surrender by telling a recipe of "Coq au Vin" by the radio...