Luigi Pistilli

ex-Inspector John Norton

Dagmar Lassander

Helene Sobieski

Anton Diffring

Ambassador Sobieski

Arthur O'Sullivan

Inspector Lawrence

Werner Pochath

Marc Sobieski (as Werner Pochat)

Dominique Boschero

Ambassador Sobieski's mistress

Renato Romano

Mandel, the chauffeur

Sergio Doria

Walter

Ruth Durley

Norton's mother

Valentina Cortese

Madame Sobieski

Emmet Bergin

Man in café (uncredited)

Niall Tóibín

Doctor (uncredited)

Riccardo Freda