Mister Darnétal is invited by his nephew Georges to the premiere of his extravaganza in Paris;but his partner (he did not marry her,even after all those years)is not prepared to accept it and he uses his best friend as an alibi ;the two pals intend to live a wild life in the capital where there are plenty of lovely girls.But the uncle discovers that his dear nephew has a fiancee ,actually an unwed mother for she's got a little kid.The young man has fallen for the star of his variety show,a coquette fickle Chanteuse who ,in the end ,only has eyes for her co-star in the show .Uncle gets angry ,threatens to disinherit this infamous nephew and marries the young mom ,unbeknown to his fifty-something partner who has come to meet him in Paris.
On his wedding day, Robert confesses his father-in-law that twenty years ago, he seduced a lady in a sleeping car of a train. His mother-in-law overhears the conversation and convinces Robert that she was that lady and that makes Robert's bride also his daughter. The wedding is in danger of being annulled when the trickery is finally discovered.
In a small provincial town, the new colonel of the dragoon regiment consigns all his men. Three soldiers defy orders and jump the wall. But the colonel becomes indulgent thanks to the intervention of the general who did not remain insensitive to the charm of a young American.