Gloria Guida

Polly

Leonard Mann

Paul De Revere

Joseph Cotten

Sir Arthur Dundee

Adolfo Celi

Sir Harold Boyd

Anthony Steel

Supt. Jeff Hawks

Janet Agren

Lady Gloria Boyd

Alida Valli

Lady Clementine De Revere

Franco Ressel

Sgt. Phillips

Paul Müller

Gibson

Mario Novelli

Saboteur

Elio Stefanizzi

Claudio Gora

Giuseppe Marrocco

Waiter

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)