Murder At The Baskervilles 1937
Sherlock Holmes and Watson travel to the home of their old friend Baskerville who wants Holmes to figure out who stole his prized race horse Silver Blaze and murdered the groom. The primary suspect is the young rider who loves the daughter of Baskerville, but he is innocent. Holmes finds the horse on a neighboring farm and deduces that his old enemy Moriarity is behind the mayhem.