This is it. This is the story that everyone is talking about.
If you've already seen it, then you're welcome to jump over to this Wizzle here to discuss it.
If you haven't, well, I have some advice for you.
The night that it's shown, lock all of the doors. Take the telephone off the hook. Banish your family and friends to where they'll be silent, and not bother you. Shut out the world and immerse yourself in Sherlock. You will be glad that you did.
Season One ended in a showdown between Sherlock and Moriarty, with Watson along for the ride. That was a rehearsal. This is where it all gets real. It's impossible to over-hype the telling of this tale. It is going to go down in history as one of the seminal moments in television history.
Jim Moriarty wants to destroy Sherlock Holmes. He wishes to discredit him, drive him insane, turn all of his friends (both of them) against him and ruin his reputation. Then he'll consider killing him.
Moreover, Moriarty has the genius and the funds to carry out his desires. Just for good measure, he intends to manipulate Sherlock into ensuring that Moriarty gets away with it all.
The stakes were never so high. Someone is due a fall.
Unfortunately, it's probably not the person for whom all of the fans are rooting. After all, there is a precedent and we all know what happened to the canon Sherlock in The Adventure of the Final Problem...