Princess Sonia Danidoff is staying at the Royal Palace Hotel, Paris, and withdraws $20,000 from the cashier's custody, placing the notes in a drawer in company with her magnificent rope of pearls. A few moments after a well-dressed stranger steps from behind the curtains and, with the coolest of sangfroid, steals the valuables in the very presence of the princess, and with a polite bow hands her his card and makes a dignified exit. Upon the card the name "Fantomas" slowly appears. The police are quickly upon the scene, but Fantomas, true to his nom de plume, has vanished. Inspector Robert Juve is the sleuth entrusted to track the mysterious marauder.