Cast
René Hell
Prison guard (uncredited)
Robert Rollis
Traveler on the train (uncredited)
Paul Villé
Secretary of the archives (uncredited)
Jacques Dufilho
Albert, manservant
Hubert de Lapparent
French Consul in Florence
Gérard Darrieu
Sidekick
Gabriel Gobin
SNCF employee (uncredited)
René Lefèvre-Bel
(uncredited)
Roger Dumas
Isidore Bautrelet aka 'Véritaz'
Gisèle Grandpré
Madame du Bois-Lambert
Paul Müller
Attaché of the French consulate in Florence
Ginette Pigeon
Agnès, nurse
Judith Magre
(uncredited)
Paul Préboist
Drunkard of Enghien (uncredited)
Robert Lamoureux
Arsène Lupin / Lieutenant André Laroche
Robert Dalban
Inspector Béchoux of the Judicial Police
Jean Bellanger
Sleeping car employee
Michel Etcheverry
Van Nelden, collector
Jean Galland
General
Michel Vocoret
Alida Valli
Aurélia Valéano
Yves Robert
La Ballu
Harold Kay
Henri
Pierre Duncan
(uncredited)