Le Chapeau de l'empereur

It's only been a few months since Vidocq began working for the police, complaints from jealous officers are multiplying and Mr. Henry is ready to dispense with his services. One last chance comes up for Vidocq: the police museum has been broken into, and the Emperor's hat and the black diamond have disappeared. Vidocq has just a few days to find these objects before the Emperor himself inaugurates the museum...