Telemystery: Sherlock Season 3 Episode 2 Title — The Sign of Three

The second episode of the third season of Sherlock, now filming, will be titled "The Sign of Three", co-creators Mark Gatiss and Steven Moffat have confirmed.

The storyline has not been revealed, but is almost certainly to be adapted from one of only four full-length novels to feature Sherlock Holmes, and the one in which John Watson meets his future wife Mary Morstan. Indeed, when Freeman's real-life partner Amanda Abbington was announced as a new cast member, it was assumed at the time she might play Morstan.

"The Sign of Three" is written by Steve Thompson, who wrote Season 1's "The Blind Banker" and the concluding episode to Season 2, "The Reichenbach Fall".