The concierge is angry with her tenant,young worker (and inventor) Henri,because the rent is always due."Don't worry ,he says ,pretty soon,I'll treat you to the delight of caviar." Mistaken for an agitator in the factory ,Henri is summoned to the boss' office ; the naive young man does believe that he is here to be congratulated for his invention:an improbable gadget which makes the cars and motorcars silent,a feat the official engineer has never been able to accomplish,in spite of desperate efforts .Because he is good friend with a major shareholder,Henri becomes boss for one day.