Olivier Parker, phlegmatic swindler and unemployed of great class, gives us the technique to make a fortune in one day, by betting on the credulity of racing enthusiasts. You pretend to be a rich trainer, you order a suit from the best tailor in town, you stay in the right hotels, you steal a little unlucky guy to make him a second-hand jockey, and with the help of some eccentric who will wear a cassock, an officer's hat or a Longchamp cap, depending on the circumstances, you will make the perfect jobber believe that you hold the secrets of the turf. Ferdinand Galiveau, "wholesale poultry", passing through Paris to rest from a very "astringent" job, will be the dream pigeon to walk from palace to nightclub to make him believe in a miracle. A series of gags will lead us from "Gay Paris" to the racetrack where the last one's pipe, having passed from mouth to mouth, will return to its source, and our friendly pheasant, caught at his own game, will bet himself all the money he has unduly earned on his toquard. He will only lose by a short head.