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