"Sherlock Holmes has been gone for two years. But someone isn't quite convinced that he's dead…"
So runs the brief but intriguing synopsis for Many Happy Returns, a mini episode of Sherlock set to become available via the BBC's interactive Red Button service from Christmas Day.
No cast details have been revealed for the short prequel episode so we don't know whether Sherlock himself, Benedict Cumberbatch, or his friend John, Martin Freeman, will appear but it sounds as if there are some die hard fans of the detective out there who aren't ready to give up on him even after all this time...
Many Happy Returns will be available to watch at various intervals between 25 of December and New Year's Day, when Sherlock series three proper begins.