The BBC have released the official synopsis for the opening episode of Sherlock series 3, The Empty Hearse.

BBC One’s much praised, multi-award-winning drama Sherlock, starring Benedict Cumberbatch and Martin Freeman, returns for an eagerly awaited third series of three, 90-minute films – The Empty Hearse, The Sign Of Three and His Last Vow.

The contemporary re-imagining of the Arthur Conan Doyle classic, co-created by Steven Moffat and Mark Gatiss, has caused a sensation since it first aired in the summer of 2010, the last series delivering an audience of more than 10 million viewers who have tuned in to watch Sherlock and John Watson navigate a maze of cryptic clues and lethal killers in three thrilling, action-packed adventures.

In episode one of this new series, two years after the devastating effects of The Reichenbach Fall, Dr John Watson has got on with his life. New horizons, romance and a comforting domestic future beckon. But, with London under threat of a huge terrorist attack, Sherlock Holmes is about to rise from the grave with all the theatricality that comes so naturally to him. It’s what his best friend wanted more than anything, but for John Watson it might well be a case of ‘be careful what you wish for’! If Sherlock thinks everything will be just as he left it though, he’s in for a very big surprise…

Benedict Cumberbatch returns as Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft, Rupert Graves as Inspector Lestrade, Una Stubbs as Mrs Hudson, Amanda Abbington as Mary Morstan and Louise Brealey as Molly Hooper.

The airdate is still to be confirmed although the BBC place it in their Christmas line-up between 21 December and 3 January. New Year’s Day has been heavily rumoured.