Leading man Michel Piccoli plays Pierre, a young musician who briefly catches sight of a beautiful woman dressed in blue and soon spends all of his time trying to track her down. After roaming the streets of Paris in search of the mystery woman, he recruits an old friend to help find her.
A uranium deposit brings turmoil to the small South American republic of Guatalpa. Between two revolutions, the government tries unsuccessfully to decide whether the Americans, Soviets or Cubans will exploit the concession. Delegates from these nations spy on and betray each other to achieve their goal.
The Eloi family, who have just won the "model family" competition, set off for winter sports. Also on the trip are Aunt Gabrielle and Dagobert, the village warden. For the eccentric little group, the initiation to the joys of skiing begins with a lot of excitement. The vacation gets complicated when a Hindu prince has a precious diamond stolen from the local hotel.
Inspector Bérurier, having inherited a mansion three years earlier, comes to collect rent from the tenant when the latter is murdered under mysterious circumstances. Béru calls Commissaire San Antonio to the rescue, and the two men discover that Laurenzi's hotel is home to a "brothel" whose director, Madame Albertine, soon reveals to the two policemen that Laurenzi was having an ongoing relationship with Helga, one of the boarders, and Mr. Max, a regular guest of the house.
Mr Jo, nicknamed "the man with the Buick", is the darling of the small town of Honfleur. But he is in fact a trafficker with a bad reputation who would like to forget about his past, now limiting himself to smuggling rubies under the cover of a charitable organization which offers underprivileged children holidays in Switzerland. However, Mr. Jo is in love with a pretty widow and, in order to marry her, he is willing to get involved in a hold-up again. And "the man with the Buick", who seemed so honorable, will surprise the inhabitants of Honfleur when Inspector Menard reveals his secret activities.
Mathieu is a mild-mannered man engaged to a woman whose father is involved in running a house of prostitution. When the father dies, Mathieu inherits the bordello and is unprepared for his new position. He overcomes his shyness and becomes a sexual dynamo when his workers feed him some powerful amphetamines.
A man is alone in Paris during the month of August while his woman and children go on vacation. He meets a young English girl posing as a model who came to Paris for a shoot.
A wealthy young American woman is suddenly cut off by her father while living in Paris. A philosopher, she tries to make a living as a guide in the capital. The Marquis de Cernay, who has his eye on Nancy's portfolio, engages Maurice, a hardworking writer, to follow the young woman. She learns from both of them that they are only interested in her fortune. However, when she learns of the deception, she returns to her usual social life. She will return to him when the Marquis de Cernay has betrayed himself once and for all.