Sherlock co-creator Steven Moffat has hinted that fans have missed a vital clue from the show's second series finale.
WARNING: this article contains a major spoiler for those who have not yet watched last Sunday's programme:Spoiler:
"I've been online and looked at all the theories," Moffat told the Radio Times. "And there's one clue that everyone's missed."
He added: "It's something that Sherlock did that was very out of character, but which nobody has picked up on."
Moffat and series co-creator Mark Gatiss have confirmed that Sherlock will return for a third series, indicating that they have no plans to end the hit detective drama.
"We love doing this, this is brilliant fun so [we'll keep going] as long as we can keep Benedict [Cumberbatch] and Martin [Freeman] coming back," said the writer.
The second series of Sherlock concluded on Sunday night, pulling in 7.9m for BBC One.
