Sherlock Holmes and The Pearl of Death - 1944

The Pearl of Death is a 1944 Sherlock Holmes film starring Basil Rathbone as Holmes and Nigel Bruce as Dr. Watson, the ninth of fourteen such films the pair made. The story is loosely based on Conan Doyle's short story "The Adventure of the Six Napoleons" but features some additions, such as Evelyn Ankers as an accomplice of the villain played by Miles Mander, and Rondo Hatton as a brutal killer.
Master criminal Giles Conover (Miles Mander) steals the famous "Borgia Pearl" from the Royal Regent Museum under the very nose of Sherlock Holmes and Dr. Watson, but when caught the pearl is not found on him, he is released.