Antoine Fournier, a language teacher at a secondary school in Lille, was disgraced by four young men he had caught stealing money from a charity collection. Dismissed from the teaching profession, Fournier found a job as a porter in a Monte Carlo palace through his wartime friend Ansaldi. A few years later, when he became the first concierge, the "man with the golden keys", chance brought him into the presence of the young men, married but as Machiavellian as ever. He won't take revenge on them, but their baser instincts will.

In a maternity hospital, young single mothers are accompanied by social worker Hélène Lambert, who tries to make them aware of their new responsibilities, while Dr. Baurain stresses the importance of their moral and sexual education. They come to the aid of several young women: one who would like to give up her child to a couple applying for adoption, another who, after the death of her first baby in dramatic circumstances, is expecting a second, and many others.

Two French advertising agencies vying for a contract with a manufacturer of washers. The manager decides to hire the agency submitting the best advertising campaign. Jean Francois, head of the A.P.N., has the great idea of ​​looking for an authentic Portuguese washerwoman to present the ads. But competition, the O.P.I., led by the attractive Catherine, on a trip to Portugal, check the washer ideal. It is a shy girl who is happy with life in Portugal and refuses to accept the proposals of Catherine. And here intervenes Jean François, who pretends to fall for her to take her to Paris ..

Convicted of murdering his wife, a crime of which he declares himself innocent, Jacques Mazur is serving a long sentence in a prison where his presence causes disruption.

The lucky Baron wins a boat in a card game and takes off with his former lover to find new adventures. Adverse circumstances land them in a small town, where the Baron's seafaring companion leaves for more attractive scenery offered by a wealthy local man. Meanwhile, there is a certain charming cafe owner that the Baron finds irresistible -- at least for awhile.

A beautiful and sophisticated teenager is placed in a regimented French girls' boarding school after her father apparently commits suicide over a business scandal. She immediately gains admirers -- a lustful middle-aged artist, a handsome young composer, a fellow female student -- as well as a jealous rival. With the help of her schoolmates, she attempts to elope with the composer, but the adults catch on to the plot, and she is locked into her room at night.