Sherlock Holmes has retired. But when MacDonald asks him to take on another case, he says yes. There have been some mysterious murders, and there are no visible causes for the deaths. At the same time Holmes gets this case, Graf Udo Von Felseck gives him another case: find a young and missing prince to prevent war between Germany and England. But Von Felseck is not as honest as he seems...
Unfortunately the movie The Masks of Death is not yet available on HBO Max.
| Writing | Arthur Conan Doyle | Characters |
| Sound | Malcolm Williamson | Original Music Composer |
| Writing | N.J. Crisp | Writer |
| Directing | Roy Ward Baker | Director |
| Art | Geoffrey Tozer | Art Direction |
| Camera | Brendan J. Stafford | Director of Photography |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Production | Clifton Brandon | Production Manager |
| Costume & Make-Up | Ernest Gasser | Makeup Artist |
| Editing | Chris Barnes | Editor |
| Costume & Make-Up | Mark Nelson | Hairstylist |
| Production | Kevin Francis | Executive Producer |
| Costume & Make-Up | Roy Ashton | Makeup Artist |
| Costume & Make-Up | Mary Sturgess | Hairstylist |
| Sound | Danny Daniel | Sound Recordist |
| Sound | Otto Snel | Sound Re-Recording Mixer |
| Production | Norman Priggen | Producer |
| Writing | Anthony Hinds | Screenstory |
| Sound | Roy Baker | Sound Editor |
| Sound | Karen G. Wilson | Assistant Sound Editor |
