Fates of multiple otherwise disconnected characters intertwine miraculously under the sky of Paris. And it all happens in one day.

Travelers who have missed their correspondence are forced to spend the night in the waiting room of a small country station. They are told that a ghost train rushes through the night on each anniversary of an accident that once took place there. A detective tries to solve the case.

A doctor is married to an overly jealous wife who wants a divorce. He advises one of his very shy patients to take a mistress when he feels attracted to the latter's fiancée. The "sick", meanwhile, feels weaknesses for the wife.

In the lead up to WWII, several escapist French films were made promoting health and sport among youth.In this one, we see the friendship of young males on a Marne river rowing team threatened by the presence of a typical femme fatale.

Two friends, mobilized together and idle, send their photos to two young workers. The photos are inverted, resulting in a real sentimental imbroglio which finds its best conclusion in the context of the Théâtre aux Armées.

Professor Branck invented Fortuna a machine providing absolute luck, fortune and success, to whoever uses it, provided they are a virgin. Trying the experiment, Lucien Lepur, a street vendor who has never known a woman before, becomes the man of all successes. But he soon regrets Micheline his fiancée and finds himself under the influence of Professor Branck. Helped by Casimir, Micheline snatches Lucien from Professor Branck. Falling into her arms, Lucien loses all his powers but wins love.