A group of inhabitants from Ferté-sous-Jouarre decide to spend their jackpot on a three day trip to Paris.
The Baroness de Courtebise presides over an association of mothers-in-law with grievances against their sons-in-law. Armed with her prerogatives, she forbids the marriage of her daughter-in-law to the mayor's nephew, especially as an inheritance is in doubt. The ladies kidnap, the men kidnap, the election campaign turns sour and the Baroness must capitulate. She takes revenge by falling into the mayor's arms.
In Paris in 1314, the knight Jean Buridan is in love with Mirtille but the young woman is already coveted by the king's brother.
