Robert Lamoureux
Arsène Lupin / Lieutenant André Laroche
Robert Dalban
Inspector Béchoux of the Judicial Police
Alida Valli
Aurélia Valéano
Jacques Dufilho
Albert, manservant
Yves Robert
La Ballu
Roger Dumas
Isidore Bautrelet aka 'Véritaz'
Hubert de Lapparent
French Consul in Florence
Jean Bellanger
Sleeping car employee
