The problems raised by the project to eliminate a secondary railroad line in Provence.
Rosette is young and charming but she is crippled so she cannot make the most of her life. Which upsets Jules Petitpas, a single inventor, her eccentric but kind-hearted neighbor. Jules pledges to help her by creating a potion that will cure her. Unfortunately he dies before being able to achieve his aim. But a promise is a promise, and the good man comes back to the land of the living as an ... ectoplasm! And he manages to involve a whole tribe of ghosts to assist him in the noble task of saving the young lady. All is well that ends well.
Léon, André, Christiane and Monique, who all study drama, decide to go camping together. Unfortunately - although unsurprisingly - their old jalopy breaks down on the road. Chance has it that in the village where they are stranded a historical movie is being shot by famed director Médéric, starring sexpot Barbara Glamour and Latin heartthrob Edouardo Tocato. Two of the young people start flirting with the two film stars until their friends make them see reason : they love each other. The four of them end up being hired as extras and all is well that ends well.
Back from America, famous singer Charles Trénet, nicknamed "Le Fou Chantant", makes the conquest of a bombshell called Anita. He tries to persuade his young friend Georges to follow them to the French Riviera but the pessimistic gloomy finicky fellow won't do it. Instead, he decides to go on holiday with his newly married wife but the trip , due to his grim mood, is no bed of roses. In Juan-lès-Pins they finally meet Charles, who is so infatuated with Anita that he has forgotten to meet his old friend Henri Poupon, the Meridional actor. Thanks to cheerful Charles and to the sunny climate, Georges relaxes and things improve in his relationships with his wife. The couple can applaud Charles who is giving one of his concerts there before he flies back to the USA, on Anita's arm this time.
