At the request of Inspector Lestrade, Sherlock Holmes investigates a double murder on a theater stage. Suspect number one is Irene Adler. In the investigation, as always, he is assisted by Dr. Watson.
| Actor | Role |
|---|---|
 Patrick MacneeSherlock Holmes | Sherlock Holmes |
| JJohn Scott-PagetDr. Watson | Dr. Watson |
| CColin SkinnerInspector Lestrade | Inspector Lestrade |
| JJack MacreathMoriarty / Rex | Moriarty / Rex |
| CCraig BowlsbyLance Sterling | Lance Sterling |
| SSophia ThornleyMrs. Hudson | Mrs. Hudson |
| CCarolyn WilkinsonIrene Norton | Irene Norton |
| DDrew KempCampbell | Campbell |
| NNed LemleyStonegrimble | Stonegrimble |
| EEd BelangerStriker | Striker |
| DDale KellyGadsby | Gadsby |
| RRob VanderbrinkKing of Bohemia | King of Bohemia |
| CColleen BignellQueen of Bohemia | Queen of Bohemia |
 David WoodThe Body | The Body |