Paul Blanc runs a butcher's shop with his Neapolitan wife, the vivacious Giulia. One night, thanks to sleeping pills received from his brother in Argentina, he dreams of horse racing and sees in his dream the order of arrival of the horses. Giulia praises her husband's gift at the local café. But the turfmen dissuade her from betting on the nags chosen by Paul, who they consider to be real losers! But her vision proves to be right. When her secret is discovered, everyone wants to buy this miracle medicine. But the product is no longer manufactured, as it is considered dangerous and has been banned by the authorities.

Goubi, the simpleton of his village in the French Department Allier, has but one wish: to see Paris. One day, the truckers Grafouillère deposit a drunk Goubi in the biggest market of Paris (the "Halles"). The poor man is completely lost, but the meat merchant Dessertine takes him under his wings when he hears that Goubi was likewise 'raised by the State'...