Watch the first trailer for the Sherlock Christmas special
The trailer for the Sherlock Christmas special has been unveiled, click below to watch it.
The special will see Benedict Cumberbatch's Sherlock and Martin Freeman's Watson in England in the 1890s, attempting to solve a particularly difficult murder mystery.
Speaking earlier this year about the special, Moffat revealed that the special is "a separate entity on its own", not the next chapter for Holmes and Watson.
He said: "The special is its own thing. We wouldn’t have done the story we’re doing, and the way we’re doing it, if we didn’t have this special. It’s not part of the run of three episodes. So we had this to do it – as we could hardly conceal – it’s Victorian. Mark Gatiss and me, we wanted to do this, but it had to be a special, it had to be separate entity on its own. It’s kind of in its own little bubble."
Series four of Sherlock is expected to be filmed in the spring of 2016. You can catch up on all the show's previous instalments here in our online store.