Cast
- Raymond Gérôme as Sherlock Holmes
- André Haber as Watson
- Christian Alers as Le docteur Mortimer
- Jean-Pierre Gernez as Sir William Baskerville
- Bernard Musson as Barrymore, le maître d'hôtel
- Christiane Moinet as Eliza, la femme de Barrymore
- Jean-Jacques Steen as Jones, le cocher de Londres
- Robert Bazil as Billy, le second cocher
- Pierre Hatet as Stapleton
- Colette Teissèdre as Beryl