Directed by Thorold Dickinson Written by Thorold Dickinson Wolfgang Wilhelm Joyce Cary Christianna Brand Produced by Sidney Cole Valentina Cortese as Maria Brentano Serge Reggiani as Louis Balan Audrey Hepburn as Nora Brentano Charles Goldner as Anselmo Michael Shepley as Manager of the British Pavilion Angela Fouldes as Nora (as a child) Megs Jenkins as Penny Irene Worth as Miss Jackson Reginald Tate as Inspector Eliot Norman Williams as Sergeant Newcombe Athene Seyler as Mrs Reginald Kellick Sydney Tafler as Syd Burnett Geoffrey Hibbert as Steenie John Ruddock as Daly Michael Allan as Rodd John Field as Fredor Luki Charlie Cairoll as themselves (clowns) Hugo Schuster as General Galborn Lionel Harris as Frack Rollo Gamble as Bentley John Penrose as Bill John Chandos as John Michael Ripper as Charlie Yvonne Coulette as Woman on London Committee Louis Mansi as Member of Paris Committee John Gabriel as Member of Paris Committee Olga Landiak as Member of Paris Committee Frederick Schiller as Galbern's Bodyguard Gaston Richer as Queval Derek Elphinstone as Plain Clothes Man Edward Evans as Plain Clothes Man Jack McNaughton as Postman Ingeborg von Kusserow as Shoe Shop Girl Bob Monkhouse as hairdresser Sam Kydd as Detective Sergeant