After a detective is assaulted by thugs and placed in an asylum run by Professor Baum, he observes the professor's preoccupation with another patient, the criminal genius Dr. Mabuse the hypnotist. When Mabuse's notes are found to be connected with a rash of recent crimes, Commissioner Lohmann must determine how Mabuse is communicating with the criminals, despite conflicting reports on the doctor's whereabouts, and capture him for good.
The story takes place on the Riviera, where the title character may or may not be involved in various shades of skullduggery, including murder.
Rouletabille interrupts his vacation in Hungary to fight a gang of air pirates with his boss Sainclair and the daughter of Budapest's chief of Police.
N/A
