With the fourth season of the acclaimed BBC series not due out till early 2016, the Christmas special trailer has dropped to wet our appetites.

The special is a one-off and puts Holmes (Benedict Cumberbatch) and Watson (Martin Freeman) in Victorian England.

No word yet if it will be set on a classic Sir Arthur Conan Doyle novel, but it has all the earmarks of the classic tales, including iconic deerstalker.

Click play above to watch the trailer.