Sherlock co-creator Steven Moffat has hinted that fans have missed a vital clue from the show's second series finale.

'The Reichenbach Fall' saw Sherlock (Benedict Cumberbatch) apparently plummet to his death, only for the character to later reappear unharmed.

"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.

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Watch a clip from the Sherlock series two finale below:

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