Sherlock waits to see where Moriarty will make his posthumous move. One mysterious case in particular baffles Scotland Yard but Sherlock is more interested in a seemingly trivial detail. Why is someone destroying busts of the late Prime Minister Margaret Thatcher? Is there a madman on the loose, or is there a much darker purpose at work, something with its roots deep in Mary Watson's past?
Did You Know?
Amanda Root (Emma Welsborough) had a part in the The Iron Lady
(2011), a biographical film about Margaret Thatcher. See more
It is highly unlikely that one policeman would barge into a room where two shooters are and without any warning, shoot only one of them. Then, like nothing happened, the story continues. See more
What you're about to see is classified beyond top secret. Is that quite clear? Don't minute any of this. Once beyond these walls, you must never speak of it. A D-notice has been slapped on the entire incident. Only those within this room, code-names Antarctica, Langdale, Porlock and Love, will ever know the whole truth. As far as everyone else is concerned, going to the Prime Minister and way beyond, Charles Augustus...
Are you tweeting?
Right after the end credits Mary's video cuts back and Mary says "Go to hell, Sherlock". See more
Sherlock Theme Song
Performed by David Arnold
and Michael Price See more