A brilliant swindler Olivier Parker hires a small-time pipe salesman Amédée to swindle a naive provincial Ferdinand Galiveau a chicken merchant. Renamed Teddy Morton and now a jockey Amédée must ride a mare on which Ferdinand advised by Parker must bet. Absolutely convinced of his mystification Parker bets on an oddball who of course loses while at the last minute Galiveau having bet on an outsider wins a fortune. All Parker has to do is find another sucker.