First broadcast 15th September 1985.

Sherlock Holmes is contacted by Dr Trevelyan whose medical practice was set up and paid for by Mr Blessington who lives on the premises.

Jeremy Brett ... Sherlock Holmes
David Burke ... Dr. John Watson
Nicholas Clay ... Dr. Percy Trevelyan
Patrick Newell ... Blessington
Tim Barlow ... Russian Count
Brett Forrest ... Count's Son
Charles Cork ... Cartwright
John Ringham ... Inspector Lanner
Rosalie Williams ... Mrs Hudson
David Squire ... Fenton
Norman Mills ... Detective
Lucy Anne Wilson ... Nora
Dusty Young ... Carpenter