A pilot on one of the air mail flights between France and its African colonies has a brief romance with his distressed cousin before he returns to the call of duty, and the rebels in the desert.
A husband who has just cheated on his wife returns home in the early morning, puzzled. He finds there, without knowing it, the lover of his wife, to whom he confesses his infidelity.
Marguerite and Verdurin, both employed in l'Atout Prix, a store run by Prosper Biscoton, would like to take a vacation at the beach, but they need more money than they earn. They decide to trick their boss into paying for the trip by pretending Marguerite is interested in him. Biscoton falls in the trap and puts himself in a difficult position with his own wife.
This French musical comedy was based on the stage play Mademoiselle Mozart, written by Yvan Noe, who also directed and produced the screen version. Danielle Darrieux plays Denise, the owner of a music shop that is facing closure. Wealthy young Maxime (Pierre Mingand) falls in love with Denise but knows full well that she despises rich folks and would refuse to accept his charity. Thus, Maxime arranges to secretly buy the store then takes a job with the establishment as a humble sheet-music salesman. When Denise finds out that her new employee is actually her boss, she is furious, but rest assured that Love Will Find a Way. The lovely Danielle Darrieux is permitted to sing on several occasions, which she does enthusiastically if not altogether expertly.
Bobby Guibert and Pat Duvallon are the best of friends. They are also big party animals. Honorine, Bobby's aunt, is outraged by her nephew's bad behavior, all the more as it is with her money that the young man paints the city red, always accompanied by Pat. She then decides to send them both to the West Indies, where she owns a sugar-cane plantation, in the hope that far from temptation they will reform. Once there, the two revelers come up with nothing better than - swap identities, which will be the cause of a series of cheerful misunderstandings. Everything will end not in one, but several marriages.
The pharmacist Bourrachon learns that his wife Adrienne deceives him with Dr. Rigal, whose specialties he sells in his pharmacy. His sister, the authoritarian Mrs. Bruneau, urged him to divorce and introduced Geneviève to substitute Adrienne. But after five months of marriage, Geneviève gives birth to a child whose real father turns out to be Henri, the salesman of the Bourrachon pharmacy. Mrs Bruneau will then try to persuade her brother to bring an action disavowal of paternity for the honor of the family and especially to protect the inheritance of his own daughters. But Bourrachon will eventually become attached to the child and endorse his paternity.
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.
Le Cordon Bleu doesn't refer to a ham-and-veal delicacy, though there is plenty of ham in this Gallic comedy. The scene is a posh Parisian hotel-restaurant, which ends up a hotbed of infidelity and mistaken identity. Hotel cook Regina is romantically involved with her boss Octave, the husband of Irma. Mistaken for another woman, Irma is passionately pursued by Bernereau, whose wife gets involved with someone else's husband, whose wife gets involved with.