Inspector Rizzo and Marshal Caputo go to Egypt and look for Professor Cerullo, who is missing.

Nicole Védrès' chronicle of Paris from 1900 to 1914 is brought to life through the use of original material, all authentic, secured from more then 700 films belonging to public and private collections. A few of the celebrities of the time shown are Enrico Caruso, Sarah Bernhardt, and Maurice Chevalier.

"Tu seras duchesse!" ("You'll Be a Duchess!") With these words, self-made industrialist Poisson orders his daughter Lucie to marry a wealthy Duke. The duke's father objects to the union, whereupon Poisson arranges another marriage for his daughter, this time to an impoverished and sickly young marquis. Poisson's strategy runs something like this: the Marquis is expected to die soon, whereupon the widowed Lucie will become a marquess, and thus a worthy bride for the Duke. But the Marquis foils these plans by staging a miraculous recovery. The explanation? The Marquis and Lucie have been in love all along, and this was the only way that they could wed with Poisson's blessing. Darned clever, these Frenchmen!.