Cornel Wilde Director, Screenwriter, Producer Nigel Davenport John Custance Actor Jean Wallace Ann Custance Actor John Hamill Roger Burnham Actor Lynne Frederick Mary Custance Actor Patrick Holt David Custance Actor Michael Percival Police Constable Actor Anthony Sharp Sir Charles Brenner Actor George Coulouris Mr. Sturdevant Actor Sean Forestal Screenwriter H.A.R. Thomson Cinematographer Eric Boyd-Perkins Film Editing Frank Clarke Film Editing Burnell Whibley Original Music Elliot Scott Art Director Tony Armstrong Costume Design