When a nobleman worries that the Star of Rhodesia─a large, and allegedly cursed, diamond in his mother's possession─has been targeted for theft, he engages Holmes (Basil Rathbone) and Watson (Nigel Bruce) to accompany her on a London-to-Edinburgh train trip. An unseen mastermind, however, doesn't care whose ticket he has to punch in order to possess the gem! Alan Mowbray, Dennis Hoey, Mary Forbes, Skelton Knaggs also star. 54 min. Standard; Soundtrack: English.