The plot is an original story not based on any of Sir Arthur Conan Doyle's Holmes tales, though it bears some similarity to "The Bruce-Partington Plans." Oscar Homolka was originally cast as Holmes's elder brother Mycroft, but for family reasons he refused and Mycroft's character was replaced by "Mr. Ahrens" played by Holmes Herbert.
Sherlock Holmes | Herbert Hoover | Herbert Kitchener, 1st Earl Kitchener | Herbert von Karajan | Frank Herbert | Oliver Wendell Holmes, Jr. | Oliver Wendell Holmes, Sr. | Larry Holmes | Herbert Marcuse | Oliver Wendell Holmes | Herbert Read | Herbert Blomstedt | Herbert Grönemeyer | Herbert Beerbohm Tree | Eleanor Holmes Norton | Matthew Herbert | Herbert Spencer | Victor Herbert | Holmes | Herbert | Herbert A. Simon | George Herbert | Charles Herbert Best | The Adventures of Sherlock Holmes | Katie Holmes | Herbert Howells | George Herbert, 5th Earl of Carnarvon | Brian Herbert | Aubrey Herbert | Young Sherlock Holmes |