Sherlock (2010– )
40 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

Watch Now

From $6.99 on Prime Video





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?


This story begins six months after the previous episode, Sherlock: The Empty Hearse (2014). 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 »


Written by M.I.A. Justine Frischmann, Steve Mackey and Ross Orton
Performed by M.I.A.
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

bravo for Sherlock Season Three
25 January 2014 | by ctotten1See all my reviews

Sherlock is a wonderful series that I look forward to with great anticipation. It is not simply the storyline that keeps me watching every time a new episode airs but the interaction between the characters and that is what makes them so endearing and memorable. With each episode that airs, Sherlock is learning what it is to be more human and the rest of the cast are all contributing to his understanding in their own ways and I think it is delightful. We all learn from our experiences why not Sherlock? I also enjoy the updated time frame, I was skeptical at first, but after the first episode I was entranced with the changes. If the only thing that is of major concern is the mystery, then program a computer and do away with the people. To those who called the second episode "rubbish"...well you are entitled to your opinion...and so am I and I really enjoy this. If someone does not enjoy watching the change that characters, and people, experience due to events in their lives, then why even have theater, plays, movies or entertainment at all?

23 of 36 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 40 user reviews »

Contribute to This Page

Stream 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