Created at a time when European popular culture was teeming with heroic criminal figures, Baroness Troixmonde alias "Filibus" occupies a special position. As a respected member of good society, Baroness Troixmonde, in the guise of Filibus, wreaks her adventurous havoc from a futuristic zeppelin. Long before Marlene Dietrich, Filibus, in the role of the Count de la Briève, seduces the dancing femininity as a male dandy, of course not entirely without criminal ulterior motives. But detective Hardy is doggedly on her, or rather on his, trail...