Super sleuth Sherlock Holmes and his long-suffering companion Dr Watson, played by Benedict Cumberbatch and Martin Freeman, are teaming up again for a BBC Special set in Victorian London.
The dashing detective is set to confront the ghosts of his past in a tale of mystery and intrigue, described by co-creator Stephen Moffat as being "in its own little bubble", separate from the TV series.
Aside from the horse-drawn carriages and cobbled streets, one of the most notable features of the Victorian period detail is Martin Freeman's magnificent moustache. Fans have already been treated to a short teaser featuring light-hearted banter between Sherlock and Mrs Hudson, Watson's landlady.
Sir Arthur Conan Doyle wrote his first Sherlock Holmes story, A Study in Scarlet, in 1886, creating a detective famed for his brilliant mind and remarkable powers of deduction. Conan Doyle's iconic characters, including the villainous Moriarty, have successfully made the transition from page to screen, with storylines adapted to appeal to modern day audiences.
The BBC series gives the classic tales a contemporary twist and features central London locations, including Soho, Trafalgar Square, Waterloo, Victoria and 221b Baker Street - Sherlock's fictional address.
This house is now designated as a building of "special architectural and historical interest", and the first floor study overlooking Baker Street, maintained as it was in Victorian Times, is open to the public as a museum.
A trailer has been released for the hotly anticipated New Year Special, entitled The Abominable Bride, which is scheduled for broadcast on 1 January. This will be followed by Sherlock Season 4 later in 2016. As Sherlock sums up: "The stage is set, the curtain rises.. we are ready to begin."