VIDEO: Sneak Peek & Behind-the-Scenes of BBC's SHERLOCK, Season 3

BBC One has released a promo for the third episode of SHERLOCK, Series 3, airing on Sunday, January 12th. In the episode ttled "His Last Vow," a case of stolen letters leads Sherlock Holmes into a long conflict with Charles Augustus Magnussen, the Napoleon of blackmail, and the one man he truly hates. But how do you tackle a foe who knows the personal weakness of every person of importance in the Western world?

In addition, the network has debuted behind-the-scenes clip featuring the cast and crew talking about Sherlock's best man speech, how things will change for Sherlock and John, and Martin Freeman and Amanda Abbington on working together.

Check both videos out below!

Co-created by Steven Moffat and Mark Gatiss, Sherlock follows Sherlock Holmes and Dr. John Watson's adventures in 21st Century London in "a thrilling, funny, fast-paced contemporary reimagining of the Arthur Conan Doyle classic". Rupert Graves also plays Inspector Lestrade.