Sherlock (2010– )
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The Sign of Three 

Sherlock tries to give the perfect best man speech at John's wedding when he suddenly realizes a murder is about to take place.


Colm McCarthy




Episode cast overview, first billed only:
Benedict Cumberbatch ... Sherlock Holmes
Martin Freeman ... Dr. John Watson
Una Stubbs ... Mrs. Hudson
Rupert Graves ... DI Lestrade
Mark Gatiss ... Mycroft Holmes
Louise Brealey ... Molly Hooper
Amanda Abbington ... Mary Morstan
Vinette Robinson ... Sgt Sally Donovan
Lara Pulver ... Irene Adler
Alistair Petrie ... James Sholto
Alice Lowe ... Tessa
Yasmine Akram ... Janine
Oliver Lansley ... David
Ed Birch Ed Birch ... Tom
Jalaal Hartley Jalaal Hartley ... Photographer


As Lestrade fumes over his constant inability to convict the Waters gang of bank robbers, Holmes prepares for his role as best man at Mary and John's wedding. His speech, initially bizarre, turns out to be a moving tribute to his friend whilst he also contributes two anecdotes of recent cases, both unsolved. The first concerns a young guardsman whose life John saved after he was the victim of a 'locked room' attempted murder. The second involves a man who uses the identities of the recently deceased to date different women. As he looks around the wedding party, Holmes suddenly realizes their connected solutions, which also involve Watson's former commanding officer, disfigured war hero Major Sholto. Written by don @ minifie-1

Plot Summary | Plot Synopsis


TV-14 | See all certifications »

Parents Guide:

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Release Date:

26 January 2014 (USA) See more »

Also Known As:

The Sign of Three See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:

Dolby Digital (5.1)



Aspect Ratio:

16:9 HD
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Did You Know?


We hear a snippet of the Rihanna song, "We Found Love", early in the episode. Later, Sherlock and Watson are at Baker Street and as Sherlock walks across the room we see his mouth full of cigarettes - just like Rihanna and Calvin Harris in the video of the song. See more »


After Sherlock runs after Major Sholto and John decides to follow, the shot that has John walking through the guests shows Mary in the background having already left the table. Whereas, the next shot shows her just leaving the table. See more »


[first lines]
DI Lestrade: [leaving a couthouse] They just walked out of there.
Sgt Sally Donovan: Yeah, I know, I was sort of sitting next to you.
DI Lestrade: The whole Walters family, they just walked right out of there.
Sgt Sally Donovan: Again, I was in the room.
DI Lestrade: How do they always manage that?
Sgt Sally Donovan: They're good.
See more »


References Pulp Fiction (1994) See more »


Opening Titles
Written by David Arnold and Michael Price
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User Reviews

Sherlock at its most amusing and emotional
6 August 2016 | by grantssSee all my reviews

It is John Watson and Mary's wedding day. Holmes is the best man and has laboured over his speech, plus micromanaging the reception. While giving his speech he recounts how Watson invited him to be best man, the wedding plans and recent cases of theirs. One of the cases involved a member of the Household Guards who believed he was being stalked, and then was found stabbed in the shower, with no weapon in sight. Another case seemed bizarre - a woman who believed she had had a relationship with a ghost.

Though this episode does involve crimesolving, the focus is really on Dr Watson's wedding. This becomes a great opportunity to demonstrate Holmes' social awkwardness and the many comedic possibilities this presents. Much amusement ensues. It also provides many emotional scenes and Holmes proves himself to be unconsciously reasonably sentimental.

The crime solving is quite intriguing too, tying three seemingly independent events together.

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