The Return Of Sherlock Holmes. The Musgrave Ritual.

The Adventures of Sherlock Holmes is the name given to the TV series of Sherlock Holmes adaptations produced by British television company Granada Television between 1984 and 1994, although only the first two series bore that title on screen. The series was broadcast on the ITV network in the UK, and starred Jeremy Brett as the famous detective.

The Musgrave Ritual.
Holmes and Watson are staying with Reginald Musgrave, the head of an ancient Sussex family, when his butler, Brunton, suddenly disappears. Brunton (something of a ladykiller and a highly educated man) had been taking an interest in an ancient family tradition called 'the Musgrave Ritual', which centres on a Carolingian riddle. And then a second member of the household vanishes, equally suddenly.
The old riddle proves to be the key to tracing the butler's body and finding the treasure the dead man was after - the crown jewels lost in the English Civil War. And as so often, it's a case of 'cherchez la femme'.