Gloria Guida
Polly
Leonard Mann
Paul De Revere
Joseph Cotten
Sir Arthur Dundee
Adolfo Celi
Sir Harold Boyd
Anthony Steel
Supt. Jeff Hawks
Janet Ågren
Lady Gloria Boyd
Alida Valli
Lady Clementine De Revere
Franco Ressel
Sgt. Phillips
Paul Müller
Gibson
Mario Novelli
Saboteur
Attilio Pelegatti
Policeman
Kenneth Benda
Old Gentleman (uncredited)
Tom Felleghy
Dr. Hobbes (uncredited)
Antonio Maimone
Brooks (uncredited)
Filippo Perego
Sir Arthur's Butler (uncredited)
Maria Tedeschi
Lady Clementine's Friend (uncredited)