A simpleton turns out to be the lucky charm of a village.

Following a broadcast on the radio, each of the listeners remembers these "little nothings" (the title is borrowed from a play by Mozart), which have often changed their lives. Each of these stories told will prove that a tiny detail in life can change an entire destiny.

On the very day of his wedding, Valentin Le Barroyer sees the one he was to marry fly away. Hélène has always loved her cousin André, to the great displeasure of her aunt who had combined the failed marriage. The two lovers take refuge in the Dordogne at the home of Hélène's grandmother who believes them to be really husband and wife. Valentin finds the young couple too late, he only has to console himself with a friend of Hélène's.

Tonio, pretty Micheline's fiance, meets Georgia ,a gypsy who makes advances to him.

A bungling thief is threatened by one target with blackmail, unless the thief will kill his own cousin, a wealthy eccentric who is considered the village idiot.

Adrien Moulinet, a modest encashing agent in the Nortier bank, is also an inventor in his spare time. His latest revolutionary creation is the motorized roller skate. His problem is to be able to market them. Jules Petitpas, a jobless adman, is the right man for that.

Cecile, a young girl who goes to the offices of the Judicial Police several times in a row to complain about nightly visits to the apartment she occupies with her aunt, is not taken seriously by the police until she the day she is found murdered.

A historian seeks to clarify the mysterious death of Sire de Malvaleix and will find himself involved in the murder of the current descendant.

Louberger, director of an orphanage, is full of praise for a former boarder, Mr. Sauval, who has become their benefactor. One night he arrives and he does not seem to be exactly the man described by Louberger. He has in fact become a crooked lawyer and he is wanted for a crime he has just committed. Despite his efforts he will not escape the police but he will manage to remain, in the eyes of the children, at the height of his legend.

Emile is a French film producer at the beginning of the century. One of his friends leaves his daughter Lucette in his house, when he is starting a tour through France. Emile falls in love with her. Problems starts when his younger friend Jacques come back from military service and after complaining his misfortune with women, follows Emile's advice in starting affairs with women and he meets Lucette.