From 1921 to 1923, Stoll Pictures produced three series of silent black-and-white films based on Sir Arthur Conan Doyle's Sherlock Holmes stories. Forty-five short films and two feature-length films were produced[1] featuring Eille Norwood in the role of Holmes and Hubert Willis cast as Dr. Watson with the exception of the final film, The Sign of Four, where Willis was replaced with Arthur Cullin. Consequently, Norwood holds the record for most appearances as Sherlock Holmes in film.[1][2]