Henri, a basically honest fellow, agrees to work for a gang of burglars to avenge himself upon Fournier-Salville, a wealthy businessman who once ruined him. His role will be to become Fournier-Saville's majordomo while simultaneously keeping the burglars informed so as to facilitate their work. Once in the house he performs his job so well and so stylishly that he becomes indispensable. Moreover, Eve, the businessman's capricious daughter, does not remain insensible to his charms.