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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Verdict: Unknown
> Roy William Neill (Director)
> Maury Gertsman (Director of Photography)
> Milton Rosen (Music Director)
> Bernard B. Brown (Sound Director)
> Melville Shyer (Assistant Director)
> Frank Gruber (Screenplay)
> Arthur Conan Doyle (Novel)
