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 |
| Sound | Bernard B. Brown | Sound Director |
| Production | Roy William Neill | Producer |
| Art | Carl Lawrence | Set Decoration |
| Editing | Saul A. Goodkind | Editor |
| Camera | Maury Gertsman | Director of Photography |
| Art | John B. Goodman | Art Direction |
| Production | Howard Benedict | Executive Producer |
| Costume & Make-Up | Jack Pierce | Makeup Department Head |
| Sound | Milton Rosen | Music Director |
| Art | Abraham Grossman | Art Direction |
| Art | Russell A. Gausman | Set Decoration |
| Costume & Make-Up | Vera West | Costume Design |
| Costume & Make-Up | Carmen Dirigo | Hairstylist |
| Writing | Arthur Conan Doyle | Novel |
| Crew | Raymond Kessler | Dialogue Coach |
| Directing | Melville Shyer | Assistant Director |
| Sound | Jack A. Bolger, Jr. | Sound Engineer |
