Sherlock (2010– )
42 user 30 critic

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:

View content advisory »






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


See full technical specs »

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 »


The Beefeater guardsman shown beginning to strip out of his uniform for a shower has unbuttoned several buttons only to be shown promptly unbuttoning some of the same buttons. 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 »


December 1963 (Oh, What A Night)
Written by Bob Gaudio and Judy Parker
Performed by Frankie Valli and The Four Seasons
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Touchy, definitely appropriate before the grand finale
6 January 2014 | by prottoy_ju_17See all my reviews

I never thought I'd say that i'm happy see the human side of sherlock homes. But the portrayal was too good to say otherwise. Last two seasons were basically cliff hangers, full of suspense that got us on toes. As per the novels, the last story of sherlock adventure was "His Last Vow". That's the season ender here as well. I won't spoil anything here, but remember sherlock's vow made at the final minutes of this episode. Since the directors already announced that the finale will be mesmerizing, imagine the setup created here in this episode 2 and what effect would it have if the finale had to have a tragic ending.

In my plain opinion, the point of this episode was to make a contrast before grand finale. Just as the calm before storm. If sherlock died/got defamed before, it would be a death/defamation of a brilliant detective. Now the director added the human element too, and did so skillfully. Here you see a tormented person, troubled by his own brilliance. I found this episode to be a very unexpected variation to the main structure of storyline. And it worked for me very well.

45 of 71 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 42 user reviews »

Contribute to This Page

Free Movies and TV Shows You Can Watch Now

On IMDb TV, you can catch Hollywood hits and popular TV series at no cost. Select any poster below to play the movie, totally free!

Browse free movies and TV series

Stream Popular Action and Adventure Titles With Prime Video

Explore popular action and adventure titles available to stream with Prime Video.

Start your free trial

Recently Viewed