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.
Unfortunately the movie Terror by Night is not yet available on HBO Max.
| Directing | Roy William Neill | Director |
| Writing | Frank Gruber | Screenplay |
| Camera | Maury Gertsman | Director of Photography |
| Editing | Saul A. Goodkind | Editor |
| Sound | Milton Rosen | Music Director |
| Art | John B. Goodman | Art Direction |
| Art | Abraham Grossman | Art Direction |
| Sound | Bernard B. Brown | Sound Director |
| Art | Russell A. Gausman | Set Decoration |
| Art | Carl Lawrence | Set Decoration |
| Costume & Make-Up | Vera West | Costume Design |
| Costume & Make-Up | Carmen Dirigo | Hairstylist |
| Costume & Make-Up | Jack Pierce | Makeup Department Head |
| Production | Howard Benedict | Executive Producer |
| Production | Roy William Neill | Producer |
| Writing | Arthur Conan Doyle | Novel |
| Sound | Jack A. Bolger, Jr. | Sound Engineer |
| Crew | Raymond Kessler | Dialogue Coach |
| Directing | Melville Shyer | Assistant Director |
