First broadcast 4th April 1994.

Sherlock Holmes has disappeared into the Highlands, while Mycroft investigates the theft of the Mazarin diamond and Watson suspects a trap in an offer of $5 million to a former professor if he can find a third man surnamed Garrideb.

Jeremy Brett ... Sherlock Holmes
Edward Hardwicke ... Doctor Watson
Charles Gray ... Mycroft Holmes
Rosalie Williams ... Mrs Hudson
Phyllis Calvert ... Agnes Garrideb
Barbara Hicks ... Emily Garrideb
Jon Finch ... Count Sylvius
James Villiers ... Lord Cantlemere
Denis Lill ... Inspector Bradstreet
Gavan O'Herlihy ... John Garrideb / James Winter
Helen Ryan ... Princess of Wales
Richard Caldicot ... Nathan Garrideb (as Richard Caldicott)
Harry Landis ... Ikey Sanders
Michael Wynne ... Commissionaire Jenkins