The Secret Kingdom A wealthy man who acquires a mind-reading machine is soon horrified to discover what people are really thinking. Details Casts Title The Secret Kingdom Release Date 1925-08-01 Runtime 01 Hours 44 Minutes Genres Drama Fantasy Production Companies Stoll Picture Productions Production Countries United Kingdom Matheson Lang... John Quarrain... Stella Arbenina... Mary Quarrain... Eric Bransby Williams... Philip Darent... Genevieve Townsend... The Secretary... Rudolph De Cordova... The Protege... Robin Irvine... The Son... Lilian Oldland... The Daughter... Frank Goldsmith... Henry...