In Nazi-occupied Paris, despite a thriving appearance, many remain deprived of crucial food, including pork. In financial desperation, upright Marcel Martin (Andre Bourvil) begins working for the black market. On a night when he must deliver four bags of pig carcasses, he enlists the help of street artist Grandgil (Jean Gabin). Through a long night avoiding German patrols, the men make their way across Paris to deliver their goods, often more at war with each other than their actual enemy.