Alfred Hitchcock Director Esmond Knight Johann Strauss the Younger Actor Jessie Matthews Rasi Actor Edmund Gwenn Johann Strauss the Elder Actor Fay Compton Countess Helga von Stahl Actor Frank Vosper Prince Gustav Actor Robert Hale Ebezeder Actor Charles Heslop Valet Actor Betty Huntley-Wright Lady's Maid Actor Hindle Edgar Leopold Actor Sybil Grove Mme. Fouchett Actor Bill Shine Carl Actor Cyril Smith Secretary Actor Marcus Barron Drexter Actor Bertram Dench Engine driver Actor B.M. Lewis Domeyer Actor Guy Bolton Screenwriter Alma Reville Screenwriter Thomas Charles Arnold Producer Glen MacWilliams Cinematographer Charles Frend Film Editing Mme. H. Wurtzer Film Editing Alfred Junge Art Director