Le Bouif is a popular figure on the Parisian racetrack. He has the patter, the aplomb, the bonhomie, which allows him to pass on indestructible pipes to the racegoers. The amazement is general when he is accused of murdering the person of his son-in-law and then suspected of having suppressed the owner of a stable. Faced with the stubbornness of the examining magistrate, but helped by sympathetic young people, the Bouif proves his innocence and, back on the lawn, measures his popularity.