Sherlock returns! But for John Watson it might be a case of 'be careful what you wish for.

Sherlock faces his biggest challenge of all – delivering a Best Man’s speech on John’s wedding day! But all isn't quite as it seems. Mortal danger stalks the reception - and someone might not make it to the happy couple's first dance.

A case of stolen letters leads Sherlock Holmes into a long conflict with Charles Augustus Magnussen, the Napoleon of blackmail, and the one man he truly hates.

Sherlock waits to see where Moriarty will make his posthumous move.