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Gloria Guida

as Polly

Leonard Mann

as Paul De Revere

Joseph Cotten

as Sir Arthur Dundee

Adolfo Celi

as Sir Harold Boyd

Anthony Steel

as Supt. Jeff Hawks

Janet Agren

as Lady Gloria Boyd

Alida Valli

as Lady Clementine De Revere

Franco Ressel

as Sgt. Phillips

Paul Müller

as Gibson

Mario Novelli

as Saboteur

Elio Stefanizzi

as

Claudio Gora

as

Giuseppe Marrocco

as Waiter

Attilio Pelegatti

as Policeman

Kenneth Benda

as Old Gentleman (uncredited)

Tom Felleghy

as Dr. Hobbes (uncredited)

Antonio Maimone

as Brooks (uncredited)

Filippo Perego

as Sir Arthur's Butler (uncredited)

Maria Tedeschi

as Lady Clementine's Friend (uncredited)