Episode details for the third and final episode of Sherlock’s second series have been released by the BBC. Can Sherlock survive The Reichenbach Fall?

James Moriarty – the greatest criminal mind that the world has ever seen. Sherlock and John knew he wouldn’t stay hidden for long. But even they never guessed the sheer scale and audacity of the crime that would propel Moriarty back into the headlines. The crime of the century. The Tower of London, the Bank of England, Pentonville prison – all sprung open on the same day as if by magic! But Moriarty’s plans don’t stop there…

Sherlock and John lock horns with their old enemy in one final problem that tests loyalty and courage to their very limits. Sherlock must fight for his reputation, his sanity and his life. But is he all he claims to be?

Benedict Cumberbatch plays Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft, Rupert Graves as Inspector Lestrade, Una Stubbs as Mrs Hudson, Andrew Scott as Moriarty, Louise Brealey as Molly Hooper

It airs 15 January 2012 at 8.30pm on BBC1.