A charming and very daring thief known as Arsene Lupin is terrorizing the wealthy of Paris, he even goes so far as to threaten the Mona Lisa. But the police, led by the great Guerchard, think they know Arsene Lupin's identity, and they have a secret weapon to catch him.
John Barrymore
as Duke of Charmerace
Lionel Barrymore
as Detective Guerchard
Karen Morley
as Sonia
John Miljan
as Prefect of Police
Tully Marshall
as Gaston Gourney-Martin
Henry Armetta
as Sheriff's Man
George Davis
as Sheriff's Man
John Davidson
as Gourney-Martin's Butler
James T. Mack
as Laurent
Mary Jane Irving
as Marie
Mischa Auer
as Louvre Tour Guide (uncredited)
Symona Boniface
as Party Guest (uncredited)
