Will Sherlock be back at 2.21pm today? The plot thickens

BBC has been teasing Sherlock fans with mysterious messages on Twitter showing images of Moriarty and the words Miss Me?, but very little else.

According to the tweets more will be revealed about series 4 at 2.21pm today, a nod to the fact that Sherlock lives at 221b Baker Street.

As well as the picture with the words “Did you Miss Me?”, a writer Mark Gastiss has also got into the act by tweeting: “It’s all gone dark….Something’s coming…..Or someone…”

“Did you miss me?” #221back. #Sherlock http://t.co/sJXE1VeFaG

— Sherlock – #221back (@BBCOne) July 1, 2014

It’s all gone dark… Something’s coming… Or someone. Details at 2.21pm tomorrow. #221back #Sherlock

— Sherlock – #221back (@BBCOne) July 1, 2014

But what – or who – could it be?

Will the brilliant Andrew Scott be resurrecting the role of villainous Moriarty once again?

Will we find out when the next series is due on our screens?

We know very little about series 4 so far, with concern that it might be two years – TWO YEARS! – before it returns.

Sherlock co-creator and star Mark Gatiss, who told a Sherlock Q A in Brazil earlier this year that they would have to wait until 2016 for the next series, has also been getting in on the act with his tweets.