Lady Margaret Carstairs possess a 423 karat diamond, known as the 'Star of Rhodesia' and her son employs Holmes to protect the priceless jewel until it reaches its home in Scotland. Lady Margaret's son is found murdered and the 'Star of Rhodesia' has been whisked away. Eccentric and suspicious passengers line the Scotland Express as Sherlock Holmes, Dr. Watson and Inspector Lestrade (Dennis Hoey) investigate. Stars Basil Rathbvone, Nigel Bruce.
Nigel Bruce,Basil Rathbone
Holmes and Watson risk their lives to deliver a diamond via train through England.