Fabio Testi as Enrico Rosseni

Karin Baal as Herta Rosseni

Cristina Galbó as Elizabeth Seccles (as Christine Galbo)

Joachim Fuchsberger as Inspector Barth

Günther Stoll as Professor Bascombe

Claudia Butenuth as Brenda Pilchard

Camille Keaton as Solange Beauregard

Maria Monti as Mrs. Erickson

Giancarlo Badessi as Mr. Erickson

Pilar Castel as Janet Bryant

Giovanna Di Bernardo as Helen Edmonds

Vittorio Fanfoni as Enrico's Landlord

Marco Mariani as Father Webber

Antonio Casale as Mr. Newton (as Antony Vernon)

Emilia Wolkowicz as Ruth Holden (as Emilia Wolkowich)

Daniele Micheletti as Mr. Bryant

Antonio Anelli as Father Herbert

Rainer Penkert as Mr. Leach, the Headmaster

Carla Mancini as Susan, a Student

Joe D'Amato as CID Officer w / The Daily Telegraph (uncredited)

John Gayford as Joseph Kane (uncredited)

Alfonso Giganti as Man at Church (uncredited)

Charles Howerton as Phillip Sullivan (voice) (uncredited)

Maria Michi as Brenda's Mother (uncredited)

Alfred Vohrer as Edgar Wallace (voice) (archive footage) (uncredited)

Joe Wadham as Policeman (uncredited)

Augusta Di Vincenzi as Woman in church (uncredited)

Rory MacDonald as Phillip Sullivan (uncredited)