The BBC has released a new image from the upcoming Sherlock special. The picture features stars Benedict Cumberbatch and Martin Freeman dressed in period costume for the episode, which is set in Victorian times. Creator Steven Moffat revealed earlier this year the special would be a historical adventure that stood alone from the main series. Series four of Sherlock is due to return to screens in 2017. The BBC has not confirmed when the special episode will be broadcast, but it is rumoured to be around Christmas time this year. Speaking ahead of a Sherlock panel at Comic-Con later, Moffat said the 90-minute episode would be "a different version of the show we're used to".
