It’s the big day, Sherlock fans! Benedict Cumberbatch’s super sleuth has to solve a murder and deliver a best man’s speech, as John Watson gets married!

Update: Read our Sherlock recap now!

It seems Sherlock episodes are like buses – you wait two years for one, and then two come along at once! Just four days after the explosive series 3 opener “The Empty Hearse,” we’re treated to another dose of the great detective. But this time, there’s a different question on everyone’s lips. We know how Sherlock survived “The Reciehnbach Fall”, but now everyone is getting in a fluster about the show’s latest mystery: Just what will his best man’s speech at John Watson’s (Martin Freeman) and Mary Morstan’s (Amabada Abbington) wedding entail?

In episode two of this new series, 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!

Previously on Sherlock

In “The Empty Hearse” there were a lot of treats: from fan pleasing kisses and restaurant punch-ups to a secret underground terrorist plot. After revealing himself to former flatmate John Watson and his new wife, Sherlock enlisted his best friend’s help in foiling a sinister plan to blow up the Houses of Parliament on the 5 of November. By the end of the turbulent adventure, the Baker Street boys had reconciled, and the “hat detective” had revealed himself to the press once more – but a sinister threat in the form of Lars Mikkelsen’s Charles Augustus Magnussen watched their every move from the shadows…

Related: Sherlock Recap: Series 3, episode 1 “The Empty Hearse”

Now, everyone’s favorite super sleuth must endure the wedding of his best friend, and solve an enigmatic Miss Marple like murder mystery. Check out the trailer for “The Sign of Three,” based on the Arthur Conan Doyle novel “The Sign of Four” below!

The episode airs in the U.K. tonight at 8.30 pm GMT on BBC One. American viewers can catch the episode when the series returns later this month.

What are you most looking forward to in ‘The Sign of Three’?