Beautiful young housewife Séverine Serizy cannot reconcile her masochistic fantasies with her everyday life alongside dutiful husband Pierre. When her lovestruck friend Henri mentions a secretive high-class brothel run by Madame Anais, Séverine begins to work there during the day under the name Belle de Jour. But when one of her clients grows possessive, she must try to go back to her normal life.
Hélène, a fragile and romantic teenager, discovers that her father, a rich business man, has a mistress. Curious, she decides to go and meet this woman who is described as strange. At the first chance she has she goes to her house in the Ramparts of Béguines... from then on she goes back often, discovering a new world of artists and nightowls where she also experiences love in the arms of Tamara.
Star-crossed lovers Thérèse and Laurent think they've gotten away with murder after Thérèse's weakling husband "falls" from a speeding train. But when forced to contend with a blackmailer's demands and the mute accusations of Thérèse's mother-in-law, it's only a matter of time before the law, their passion or blind chance trips them up.
Celestin works as an organist at a girl's school. By day, Celestin is the meek and mild target of the girls' incessant practical jokes. By night, however, he is the celebrated composer of popular operas -- and the romantic vis-à-vis of a celebrated stage star. When schoolgirl Denise stumbles onto Celestin's secret, she threatens to tell all -- but only if Celestin refuses to escort her to the opening night of his latest opera. As a result, Denise falls in love with a handsome young soldier, while Celestin is accidentally shipped off to an army camp. A series of silly coincidences brings happiness to all concerned by fade-out time.
