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