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.



(by) (as Sir Arthur Conan Doyle), (screenplay)

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Episode complete credited cast:
Agnes Garrideb
Emily Garrideb
James Villiers ...
Lord Cantlemere
Denis Lill ...
Nathan Garrideb (as Richard Caldicott)
Ikey Sanders
Michael Wynne ...
Commissionaire Jenkins


With the British Prime Minister desperately seeking an absent Sherlock Holmes' assistance, the great detective's brother Mycroft steps in to solve the theft of the Mazarin Stone, a huge diamond taken in broad daylight from a museum display. The precious gem was soon to be returned to its original owners, the French, as a gesture of goodwill by Her Majesty's government. The inability to do so may now lead to a diplomatic incident. Using brother Sherlock's extensive files on society's criminal element, Mycroft soon focuses on Count Sylvius as the likely culprit. Dr. Watson has more time to spend in his surgery with his friend away but he is visited by two women with a mystery that would have been perfect for Holmes. They say their brother, who happened to be one of Watson's university professors, with a fantastic tale of a huge inheritance due them if only they can locate a third person that shares their own unique surname. As in turns out, the two cases are not unconnected. Written by garykmcd

Plot Summary | Add Synopsis


Crime | Drama | Mystery


TV-PG | See all certifications »




Release Date:

4 April 1994 (UK)  »

Company Credits

Production Co:

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Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Owing to the illness of lead actor Jeremy Brett, this episode had Sherlock's brother Mycroft (played by Charles Gray) written in to take Sherlock's place. See more »


James Villiers (Lord Cantlemere) is correctly listed in the end credits, but in the opening credits he is incorrectly listed as "James Villers". See more »


[first lines]
Sherlock Holmes: Watson. What is the medical term for obsession? I feel, you see... that I must lay to rest a ghost, which has haunted me for some time. I shall be away for several weeks in the highlands. Meanwhile, your patients might be encouraged by seeing you more often at your consulting room.
Doctor Watson: What about Baker Street?
Sherlock Holmes: Poste restante, Diogenes Club and the irregulars. You know my methods. Oh, I shall be watching you... with my third eye.
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Version of The Adventure of the Mazarin Stone (1951) See more »


Camptown Races
Written by Stephen Foster
Performed by Richard Caldicot
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User Reviews

A Failure at the End
19 February 2014 | by (United States) – See all my reviews

It's the problem with trying to stretch something out when it shouldn't have been done. Perhaps it wouldn't have hurt to have 40 instead of 41 episodes. Here the illness of Jeremy Brett forced the writers to contrive a single story from two disparate ones: "The Mazarin Stone" and "The Three Garridebs." It would have taken time and great creativity to work. I'm sure the writers were faced with an unenviable task. The other thing is a Sherlock Holmes story without Holmes (he was central in the two original stories), instead creating a new team of Watson and brother Mycroft. It's just a mess and a really unfitting end to one of the best things ever on television.

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