Juve languishes in prison after being arrested as FantOmas, but when the Minster of Justice is kidnapped, the public is thrown back into fear and confusion, doubting whether it is really FantOmas who has been thrown in jail. Following this renewed wave of crime, the American detective Tom Bob sends word to the press that he will travel to Paris to investigate these mysteries, but will the famous detective be able to catch FantOmas and free Inspector Juve?

"From the imaginative standpoint FantOmas is one of the richest works that exist."
--Guillaume Apollinaire
...

Fantomas having just escaped into the sewers of Paris, Juve and Fandor find themselves with few clues to go on until the great detective is approached by a Committee of Insurance Companies against Theft with a mission—to protect a secret document which details the precise location of the jewels of Empress Eugenie, wife of Napoleon III. Knowing Fantomas will try to steal this priceless treasure map, Juve sets a trap for the Arch-Criminal in the pleasure resorts of the Parisian suburbs in this, the thirty-fourth book of the series.

After leaving the captured Fantômas in the custody of Jerome Fandor, Inspector Juve is shocked to learn that the journalist has let him escape. With Fandor under suspicion of being an accomplice of the Genius of Evil, the two friends follow separate paths to track down their nemesis, with the final chapters of this, the thirty-sixth of the Fantômas novels, comprising what is surely the most dizzying, breakneck action sequence of the series.