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.

Pierre and Jacques, one of them being disguised as a woman, work for a wacky scientist to find a treasure hidden in his property by Pierre's uncle.

Charles Vigne, a wealthy banker, frees Abdul, a good genius imprisoned in a vase. To thank him, Abdul grants his wish: to become a child again, while retaining the experience he has acquired. But the "disappearance" of the banker panics the financial markets and has disastrous consequences for the bank. Eventually, Charles Vigne will ask Abdul to give him back his real age.

In Paris during the Second Empire, Count Muffat, despite his prejudices against loose women, falls madly in love with Nana, a young kept woman and star of the Théâtre des Variétés. This all-consuming passion will lead nowhere and, like Nana's other lovers, will lead him to ruin and crime... An adaptation of Émile Zola's novel Nana.

Naples of the early twentieth century. A thug keeps a girl completely submissive and, having discovered that she is the daughter of a nobleman, tries to blackmail the father.

A compilation of segments covers the seven deadly sins of greed, wrath, envy, pride, lust, sloth, and gluttony.

An art professor falls for one of his pupils who is helping him with a sculpture.

The finding of a wallet with a lot of money is the common theme of four stories, featuring a shoeshine from Seville, a clerk from Salamanca, a bullfighter from Cuenca and a newspapers seller from Paris.

An Italian adaptation of the Richard Wagner opera Lohengrin, where a woman prays for a saviour, and receives it in the form of the title character, a man who will marry her and stay by her if she never asks him his name.

Historical film directed and written by Sacha Guitry follows the the history of Paris from its founding through the significant events in the city's history.