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 | N.J. Crisp | Writer |
| Directing | Roy Ward Baker | Director |
| Writing | Arthur Conan Doyle | Characters |
| Sound | Malcolm Williamson | Original Music Composer |
| Production | Kevin Francis | Executive Producer |
| Production | Norman Priggen | Producer |
| Sound | Roy Baker | Sound Editor |
| Editing | Chris Barnes | Editor |
| Costume & Make-Up | Anthony Mendleson | Costume Design |
| Production | Clifton Brandon | Production Manager |
| Camera | Brendan J. Stafford | Director of Photography |
| Costume & Make-Up | Mark Nelson | Hairstylist |
| Sound | Danny Daniel | Sound Recordist |
| Writing | Anthony Hinds | Screenstory |
| Costume & Make-Up | Ernest Gasser | Makeup Artist |
| Art | Geoffrey Tozer | Art Direction |
| Costume & Make-Up | Roy Ashton | Makeup Artist |
| Sound | Karen G. Wilson | Assistant Sound Editor |
| Costume & Make-Up | Mary Sturgess | Hairstylist |
| Sound | Otto Snel | Sound Re-Recording Mixer |
