Two teenagers, Marie and Pierre, met in the story En vacances ! during a trip to Martinique. We travel with them again through Europe in this story. At the beginning of the story, Marie decides that she no longer wants to allow Pierre to make all the plans, and sets out on her own. The two decide to meet in Paris in a couple of days at the Arc de Triomphe. Unfortunately, neither Marie nor Pierre realizes that this day is not a good choice if you want to find someone in this location, as it is the celebration of Le jour de l'Armistice!