"A la bonne Tambouille" is the name of a popular Brussels restaurant mainly frequented by regulars and livened up by the jocundity of Jules, the picturesque old waiter. The coming of a charming young woman causes various reactions while outside police sirens are heard screaming. Shortly afterward, an armed thug bursts into the restaurant and starts robbing the customers. But Jules is watching over and the bandit will soon discover the good-natured waiter's unsuspected valor.