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.

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.

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 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.

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.

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.