Two Scotland Yard detectives investigate the murder of a young woman of mixed race who had been passing for white. As they interview a spate of suspects -- including the girl's white boyfriend and his disapproving parents -- the detectives wade through a stubbornly entrenched sludge of racism and bigotry.
You can now watch Sapphire online on the following streaming providers in the United States.
| Directing | Basil Dearden | Director |
| Writing | Janet Green | Writer |
| Costume & Make-Up | W.T. Partleton | Makeup Artist |
| Costume & Make-Up | Julie Harris | Costume Design |
| Sound | Arthur Ridout | Sound Editor |
| Production | Michael Relph | Producer |
| Sound | Philip Green | Music |
| Editing | John D. Guthridge | Editor |
| Art | Carmen Dillon | Art Direction |
| Camera | Harry Waxman | Director of Photography |
| Camera | H. A. R. Thomson | Camera Operator |
| Sound | Bill Daniels | Sound Recordist |
| Sound | Dudley Messenger | Sound Recordist |
| Crew | Arthur Alcott | Production Controller |
| Directing | Tilly Day | Continuity |
| Sound | John Dankworth | Musician |
| Sound | Harry Fairbairn | Sound Assistant |
| Art | Dickie Bamber | Standby Property Master |
| Directing | David W. Orton | Assistant Director |
| Production | Douglas Pierce | Production Manager |
| Production | Earl St. John | Executive Producer |
| Crew | Lukas Heller | Additional Dialogue |
