The BBC has released a brief teaser video and two delightfully retro posters that (quite literally) unveil the title mystery from the upcoming special Sherlock: The Abominable Bride.

Starring Benedict Cumberbatch and Martin Freeman, the New Year's Day special finds Sherlock Holmes and John Watson in 1895 London, where they're faced with an enemy from "seemingly beyond the grave."

The posters, which promise "Friendship, Adventure, Murder," are a throwback to the the classic "Sherlock Holmes" films of the 1930s and '40s, only with Cumberbatch and Freeman in place of Basil Rathbone and Nigel Bruce.

Also starring Amanda Abbington, Rupert Graves, Una Stubbs and Louise Brealey, “Sherlock: The Abominable Bride” will premiere Jan. 1 on PBS and BBC One, and in select theaters.

We’ve been here before – but what if this wasn’t the modern day but the late Victorian period? What if the world’s most famous consulting detective and his best friend lived in a Baker Street of steam trains, hansom cabs, top hats and frock-coats?

Welcome to ‘Sherlock’ in 1895!

Some things, though, remain reassuringly the same. Friendship, adventure and especially, MURDER…

Why is Thomas Ricoletti a little surprised to see his wife dressed in her old wedding gown? Because, just a few hours before, she took her own life…

Mrs Ricoletti’s ghost now appears to be prowling the streets with an unslakeable thirst for revenge. From fog-shrouded Limehouse to the bowels of a ruined church, Holmes, Watson and their friends must use all their cunning to combat an enemy seemingly from beyond the grave and the final, shocking truth about… the Abominable Bride!