Massimo Dallamano Director, Writer, Screenwriter Fabio Testi Enrico 'Henry' Rosseni Actor Karin Baal Herta Rosseni Actor Joachim Fuchsberger Inspector Barth Actor Cristina Galbó Elizabeth Seccles Actor Camille Keaton Solange Beauregard Actor Günther Stoll Professor Bascombe Actor Claudia Butenuth Brenda Pilchard Actor Maria Monti Mrs. Erickson Actor Pilar Castel Janet Bryant Actor Giovanna di Bernardo Helen Edmonds Actor Rainer Penkert Mr. Leach, the headmaster Actor Marco Mariani Father Webber Actor Emilia Wolkowicz Ruth Holden Actor Bruno Di Geronimo Writer, Screenwriter Peter M. Thouet Screenwriter Fulvio Lucisano Producer Leo Pescarolo Producer Horst Wendlandt Producer Ennio Morricone Original Music Joe D'Amato Cinematographer Clarissa Ambach Film Editing Antonio Siciliano Film Editing Gastone Carsetti Art Director Elisa Gut Art Director