
Arsène Lupin decides to run a detective agency in addition to being a gentleman thief. As a detective he happens to cooperate with police in order to unveil the criminal activities of a villain. When he succeeds the villain returns the favour. The unmasked Arsène Lupin manages to escape with the villain's gangster moll as his new companion.
Barnett, alias Arsène Lupin

L'inspecteur Béchoux

Olga Vauban

Germaine Laurent

Le journaliste

Cassire

Victoire

Brémond