Sherlock: The Sign of Three synopsis
The BBC have today released the synopsis for The Sign of Three which airs on Sunday 5th January at 21:00 GMT.
"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. Sherlock must thank the bridesmaids, solve the case and stop a killer!"