Early twentieth century, the ocean liner La Provence is bound for New York. You are Bernard d'Andrésy, a young French dandy in first class, in the middle of a half-flirtation with the beautiful Miss Nelly Underdown. A rumor spreads across the ship: the famous thief Arsène Lupin is traveling among the passengers. Everyone is looking for him, but no one can catch him. Will he manage to slip away from the authorities once again?
