The Priory School A desperate, but highly respectable schoolmaster collapses at Holmes' door. His prize pupil, the son of a wealthy duke, has vanished, seemingly without a trace. And, why is Holmes getting such poor cooperation in his investigation? Details Casts Title The Priory School Release Date 1921-04-01 Runtime 01 Hours 41 Minutes Genres Mystery Crime Production Companies Stoll Picture Productions Production Countries Eille Norwood... Sherlock Holmes... Hubert Willis... Dr. John Watson... Tom Ronald... Reuben Hayes... Charles Croker-King... Duke of Holdernesse... Irene Rooke... Duchess of Holdernesse... Mme. d'Esterre... Mrs. Hudson... Leslie English... Dr. Thorneycroft Huxtable... Patrick Key... Lord Arthur Saltire... Cecil Kerr... James Wilder...