The Sign of Four 1983

Hired by a young lady, Sherlock Holmes and Dr. Watson investigate the strange recent deaths of her missing father's friends from the army, as well as the whereabouts of the Great Mogul, the second-largest diamond in the world.

The Triumph of Sherlock Holmes 1935

Sherlock Holmes (Arthur Wontner) puts his retirement on hold to investigate one last murder. With his trusty sidekick, Dr. Watson (Ian Fleming), in tow, Holmes uses his unique insights and techniques to find clues about the murderer. He soon discovers that the diabolical plot involves not only his arch rival, professor Moriarty (Lyn Harding), but also an international cabal including American gangsters and a secret society. Holmes must unravel the case before it's too late.