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?
In this episode, John Watson is shown driving. An ongoing joke of the series is that John doesn't end up driving any vehicles. This is a nod to the fact that Martin Freeman hadn't had a driver's license for the longest time. See more
When John alights the bus, he uses the door at the front of the bus. In London, passengers board the bus using the front door and alight using the rear door. 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
References The Omen
Sherlock Theme Song
Performed by David Arnold
and Michael Price See more