Fabio Testi

Character: Enrico Rosseni

Karin Baal

Character: Herta Rosseni

Cristina Galbó

Character: Elizabeth Seccles

Joachim Fuchsberger

Character: Inspector Barth

Günther Stoll

Character: Professor Bascombe

Claudia Butenuth

Character: Brenda Pilchard

Camille Keaton

Character: Solange Beauregard

Maria Monti

Character: Mrs. Erickson

Giancarlo Badessi

Character: Mr. Erickson

Pilar Castel

Character: Janet Bryant

Giovanna Di Bernardo

Character: Helen Edmonds

Vittorio Fanfoni

Character: Enrico's Landlord

Marco Mariani

Character: Father Webber

Antonio Casale

Character: Mr. Newton

Emilia Wolkowicz

Character: Ruth Holden

Daniele Micheletti

Character: Mr. Bryant

Antonio Anelli

Character: Father Herbert

Rainer Penkert

Character: Mr. Leach, the Headmaster

Carla Mancini

Character: Susan, a Student

Joe D'Amato

Character: CID Officer w / The Daily Telegraph (uncredited)

John Gayford

Character: Joseph Kane (uncredited)

Alfonso Giganti

Character: Man at Church (uncredited)

Charles Howerton

Character: Phillip Sullivan (voice) (uncredited)

Maria Michi

Character: Brenda's Mother (uncredited)

Alfred Vohrer

Character: Edgar Wallace (voice) (archive footage) (uncredited)

Joe Wadham

Character: Policeman (uncredited)

Augusta Di Vincenzi

Character: Woman in church (uncredited)

Rory MacDonald

Character: Phillip Sullivan (uncredited)