When a woman receives a series of valuable pearls from an unknown party after the disappearance of her father, Sherlock Holmes is hired to investigate.



(novel), (dramatisation) | 2 more credits »

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Episode cast overview, first billed only:
Ann Bell ...
Paul Daneman ...
John Stratton ...
Ailsa Grahame ...
Howard Goorney ...
Grace Arnold ...
Ahmed Khalil ...
Lal Rao (as Ahmed Kahlil)
Syd Conabere ...
McMurdo (as Sydney Conabere)
Tony McLaren ...
Annabella Johnston ...
David Boliver ...
Mr. Mordecai Smith (as David S. Boliver)
Ann Way ...
Zena Keller ...


When she receives pearls beyond price and a mysterious message from an anonymous source, Miss Mary Morstan goes to the famous consulting detective of 221B Baker St., Mr. Sherlock Holmes for advice in how to answer the message. Together with his staunch comrade, Dr. John Watson, and a mutt named Toby, Holmes tracks down the secret of the Sign of Four. Written by Kathy Li

Plot Summary | Add Synopsis


Horror | Crime | Drama | Mystery





Release Date:

16 December 1968 (UK)  »

Company Credits

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Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Sherlock Holmes: Watson, how often have I said, "When you have eliminated the impossible, whatever remains, howeever improbable, must be the truth"?
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Referenced in The Dukes of Hazzard: Vance's Lady (1982) See more »

Frequently Asked Questions

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User Reviews

An absolutely wonderful film, beautifully made.
24 September 1999 | by (USA) – See all my reviews

This is an outstanding adaptation of a really weird story. Although it was made for television it was shot in 35mm and frankly, it is better made than many theatrical features done at the same time. The casting is wonderful and the production values are, as usual, outstanding.

Jeremy Brett is a delight as Holmes; his 'most winning woman' speech to Watson ranks as one of my favorite scenes in this entire series. Edward Hardwicke gives him able support.

This story featured the first chase scene ever written in a detective story, and it's staged beautifully.

It's a pleasure to watch this series after suffering through the arch, camp, or (worst of all) deadly serious Holmes films made by so many other actors. THE SIGN OF FOUR is an excellent picture by any standard and a lot of fun, period.

8 of 13 people found this review helpful.  Was this review helpful to you?

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