This murder mystery is set in a Parisian cafe and examines the mysterious murder of a famed journalist and extortionist who is killed at his table in the cafe. Though the prime suspects are gathered together( including his wife and her lover, the gun-runner, the creditor, and a playboy) and all of them have motives, none of them did it. So whodunit?
Honorin is the simple and naive stage manager of a traveling theatre troupe, whose one ambition is to once play the role of the cavalier in the opera "Francis I, or the Loves of the Beautiful Ferroniere". A hypnotist puts him to sleep and in his dreams he is transplanted to the days of the Renaissance. There, among other items, he is made a Duke by Henri VIII, fights a duel and survives a series of medieval tortures, while also bestowing some 20th century blessings on the court of Francis I.
A husband orders his wife to recover a lost slipper. The wife enlists the aid of her friend, Beatrice (Betty Stockfield) to bring the slipper to her in Switzerland, and Georges (Roger Treville) follows Betty.
The turkey keeper, Bettina, brings good luck to those who make her work. She becomes the mascot of the good King Laurent XVII whose finances are in bad shape. In order for her to retain her beneficial power, an attempt is made to separate her from her lover, but in vain.
Two husbands claim to be Freemasons so they can go out at night. Where do they go, if not to the lodge, the Masonic lodge? In reality, one goes to visit a pretty and particularly welcoming concierge in his dressing room, and the other spends his evenings in the dressing room of a little music-hall actress.
After winning a cash prize in a contest a young woman decides to visit Venice. She hires a secretary, a wealthy young man in disguise, to accompany her on the holiday. Once in Italy she attracts several suitors but her real love is her secretary. When she discovers he has deceived her she returns to Berlin on the express and he pursues her to try and declare his love. Loosely based on the 1883 operetta Eine Nacht in Venedig (A Night in Venice) by Johann Strauss II, it was a French-language version of the 1931 German film The Love Express.