Directed by Roy William Neill | Starring: Basil Rathbone, Nigel Bruce, Mary Forbes, Alan Mowbray

Holmes and Watson board a passenger train bound from London to Edinburgh, to guard the Star of Rhodesia, an enormous diamond worth a fortune belonging to an elderly woman of wealth; but within the first hour of the trip, the woman's son is murdered and the diamond stolen and any of the passengers in their car could be the killer thief.

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