Ferdinand Piat is a virtuous and timid young man who works in a pharmaceuticals laboratory, where he hopes to find a pill able to give courage to blushing guys of his kind. As for Fourageot, Ferdinand's boss, he is anything but shy. On the contrary he loves chasing dames - much to the outrage of Mme Paturin, his prude sister - and this seems to be his only raison d'être. Which does not keep him from deploring his daughter Paulette's misconduct. To remedy the situation, he decides to send her to the boarding-school run by his sister and his brother-in-law, former colonel Paturin. But the young lady proves uncontrollable there as well. The best thing to do would be to marry her. And why not to Ferdinand, as he is of impeccable morals? Unfortunately rumor starts spreading that the young fellow is an unrepentant reveler...