A mini-episode of Sherlock will be made available on Christmas Day.

Titled 'Many Happy Returns', the short episode will serve as a prequel to the show's third series, and will be available via the BBC's interactive Red Button service.

BBC

"Sherlock Holmes has been gone for two years. But someone isn't quite convinced that he's dead…" the synopsis for the episode reveals.

The episode will be available between December 25 and New Year's Day, when series three will debut on BBC One.

Watch Steven Moffat and Mark Gatiss discussing Sherlock's third series with Digital Spy below:

No casting details have yet been revealed for the episode, which will take place in the two-year gap between 'The Reichenbach Fall' and series three premiere 'The Empty Hearse'.

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