Top Billed Cast

1. 

   Robert Lamoureux

   Arsène Lupin / Lieutenant André Laroche

2. 

   Robert Dalban

   Inspector Béchoux of the Judicial Police

3. 

   Alida Valli

   Aurélia Valéano

4. 

   Jacques Dufilho

   Albert, manservant

5. 

   Yves Robert

   La Ballu

6. 

   Roger Dumas

   Isidore Bautrelet aka 'Véritaz'

7. 

   Hubert de Lapparent

   French Consul in Florence

8. 

   Jean Bellanger

   Sleeping car employee

9. 

   Liliane Chenevière

10. 

    Michel Etcheverry

    Van Nelden, collector

11. 

    Jean Galland

    General

12. 

    Gisèle Grandpré

    Madame du Bois-Lambert

13. 

    Harold Kay

    Henri

14. 

    Paul Müller

    Attaché of the French consulate in Florence

15. 

    Ginette Pigeon

    Agnès, nurse

16. 

    Anne Valon

17. 

    Michel Vocoret

18. 

    Gérard Darrieu

    Sidekick

19. 

    Pierre Duncan

    (uncredited)

20. 

    Gabriel Gobin

    SNCF employee (uncredited)

21. 

    René Hell

    Prison guard (uncredited)

22. 

    René Lefèvre-Bel

    (uncredited)

23. 

    Judith Magre

    (uncredited)

24. 

    Claude Mercutio

    (uncredited)

25. 

    Paul Préboist

    Drunkard of Enghien (uncredited)

26. 

    Robert Rollis

    Traveler on the train (uncredited)

27. 

    Paul Villé

    Secretary of the archives (uncredited)