The season finale, titled ‘Sherlock: The Final Problem’, is screening at 300 cinemas – including at branches of Odeon, Cineword, Vue and Picture House, around the UK and Ireland “with exclusive content”, at the same time that it airs on BBC1 on Sunday 15 January.
Toby Jones makes an appearance as Sherlock villain Culverton Smith in a new trailer for series four, and it seems that he has the titular hero right where he wants him.
Fans will know that this plot was already used in a previous series, so that Final Problem is unlikely to have anything to do with that part of the story.
Perhaps the most shocking thing of the short trailer is the “I love you” that Sherlock utters at the end – considering the character rarely reveals his emotions, fans will assume that something is up.