Miss Marple and Mr. Stringer are witnesses to the death by heart attack of elderly, rich Mr. Enderby. Yet they have their doubts about what happened. The police don't believe them, thus leading Miss Marple to yet again investigate by herself.
Unfortunately the movie Murder at the Gallop is not yet available on HBO Max.
| Directing | George Pollock | Director |
| Writing | Agatha Christie | Novel |
| Writing | James P. Cavanagh | Screenplay |
| Production | Lawrence P. Bachmann | Producer |
| Production | George H. Brown | Producer |
| Sound | Ron Goodwin | Original Music Composer |
| Camera | Arthur Ibbetson | Director of Photography |
| Editing | Bert Rule | Editor |
| Art | Frank White | Art Direction |
| Crew | Tom Howard | Special Effects |
| Sound | A.W. Watkins | Recording Supervision |
| Production | Irene Howard | Casting Director |
| Production | Sydney Streeter | Production Manager |
| Directing | Basil Rayburn | Assistant Director |
| Camera | Paul Wilson | Camera Operator |
| Sound | Denis Rogers | Sound Editor |
| Sound | J.B. Smith | Sound Editor |
| Sound | David Bowen | Sound Recordist |
| Directing | Betty Harley | Continuity |
| Costume & Make-Up | Maude Churchill | Wardrobe Master |
| Costume & Make-Up | Eddie Knight | Makeup Artist |
| Costume & Make-Up | Pearl Orton | Hairdresser |
| Sound | Geoffrey Kidd | Boom Operator |
| Art | John Barry | Assistant Art Director |
