In Belle Époque Paris, Gabrielle, after years of family happiness, begins to doubt the loyalty of her husband, Victor-Emmanuel, and confides her concerns to her old friend Lucien. The comedy begins to unfold when Gabrielle and Lucien, in order to test Victor, write him a letter, arranging an appointment at a dubious hotel. What they do not know is that the usually drunk Posse, Victor's double, works as a doorman at the same hotel. When all the heroes of the play arrive at the hotel, each for their own reasons, the fuse of the farce is ignited...
