Blackmail (1929) - publicity still - Photograph of John Longden, Anny Ondra and Donald Calthrop in ''Blackmail''.Blackmail (1929) - frame - Film frame from ''Blackmail''.Blackmail (1929) - publicity still - Photograph of Donald Calthrop in ''Blackmail''.Blackmail (1929) - on set - On set photograph from ''Blackmail'' (1929).Blackmail (1929) - publicity still - Photograph of John Longden, Anny Ondra and Donald Calthrop in ''Blackmail''.Blackmail (1929) - on set - On set photograph from ''Blackmail'' (1929).Blackmail (1929) - on set - On set photograph from ''Blackmail'' (1929).Blackmail (1929) - frame - Film frame of Donald Calthrop from ''Blackmail''.Blackmail (1929) - on location - On set photograph from ''Blackmail'', taken outside the British Museum. From L-R: unknown, Ronald Neame, unknown, Donald Calthrop, unknown, Alfred Hitchcock, unknown.Blackmail (1929) - frame - Film frame of Donald Calthrop from ''Blackmail''.Blackmail (1929) - frame - Film frame of Donald Calthrop from ''Blackmail''.Blackmail (1929) - frame - Film frame of Donald Calthrop from ''Blackmail''.Murder! (1930) - publicity still - Publicity still for ''Murder!'' (1930).