At the Vélodrome d'Hiver, at the height of the sports competitions, the director of the house is found murdered. We also stole the recipe for the show. A swarm of private detectives, second-hand sleuths, embark on the most diverse tracks. Arrests pile up and the chase continues amid the non-stop games. The culprit will however be caught, red-handed, by a young inspector wearing a handsome mask.

Julien Mortal, a singer from Portugal suffering from amnesia, made a career in France under the name of Paolo. One day, he discovers the truth about his past: a man tried to assassinate him.

A wealthy man has two sons,one of them is legitimate,the other is not.The first offspring has had a life of luxury and he has become a lazy good for nothing whereas the youthful indiscretion has turned into an artist.He is nicknamed "Gringalet" .Now his father wants him to meet his half-brother ,his mother-in-law and the rest of the family. Gringalet will turn this bourgeois family upside down:they become nice,the big brother becoming a perfect businessman who stops scouring nightclubs to spend most of his time with his fiancee Josette.There's the rub,cause Gringalet is also in love with her.

Chérie is a beautiful young woman who works as an escort girl. She meets a young and wealthy man who propose her to be his fictional wife so that his mother won't bother him anymore with this other girl, a rich one, she wants to see her son married to.

A ruined banker is abandoned by his mistress. He commits suicide after entrusting a prostitute with twenty-thousand francs. The money changes hands. A crook is arrested in the house of an an actress he had fooled. In a luxury hotel, a typist kills her lover's wife. The trial of the murderer is followed by the bankruptcy of another financier and the money finally returns to the mistress of a suicide in the restaurant in which she had first appeared.

An untiring lady social worker, Émilienne, has as one of her charges a stableman who was wounded by his mistress. Unfortunately, Émilienne's young sister who was helping her at work decides to go away with the stableman.