Arsène Lupin / Lieutenant André Laroche
Inspector Béchoux of the Judicial Police
Aurélia Valéano
Albert, manservant
La Ballu
Isidore Bautrelet aka 'Véritaz'
French Consul in Florence
Sleeping car employee
Van Nelden, collector
General
Madame du Bois-Lambert
Henri
Attaché of the French consulate in Florence
Agnès, nurse
Sidekick
(uncredited)
SNCF employee (uncredited)
Prison guard (uncredited)
(uncredited)
(uncredited)
(uncredited)
Drunkard of Enghien (uncredited)
Traveler on the train (uncredited)
Secretary of the archives (uncredited)