Poster
Synopsis
In London, Vivian Vedder (Renee Godfrey) verifies that a carpenter has finished a coffin for the body of his recently deceased mother, who is going to transport Scotland by train. She embarks on the train that night, as does Lady Margaret Carstairs (Mary Forbes), who owns and carries the famous Rhodesia Star diamond. On the train also travel: the son of Lady Margaret, Roland (Geoffrey Steele); Holmes, whom Roland has hired to protect the diamond; Inspector Lestrade (Dennis Hoey), who is also concerned about diamond safety; And Watson and his friend Major Duncan-Bleek (Alan Mowbray). Holmes briefly examines the diamond. Shortly after, Roland is murdered and the diamond stolen. Lestrade, Holmes, and Watson deduce nothing inconclusive when questioning the other passengers. Holmes suspects that one of the people traveling on the train is the famous jewel thief "Colonel Sebastian Moran" trying to take over the "Star of Rhodesia".