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?
The words "Reigate Square" appears on Mycroft's fridge. This is a reference to original Holmes story "The Adventure of the Reigate Squire". 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...
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During the end credits, several letters are colored red. When read sequentially, they spell out "The Six Napoleons", the title of the Arthur Conan Doyle story that this episode is loosely based around. See more
Sherlock Theme Song
Performed by David Arnold
and Michael Price See more