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