'Sherlock' Season 4 Begins Filming

Fresh off of filming their respective debuts in the Marvel Cinematic Universe, Benedict “Dr. Strange” Cumberbatch and Martin “Everett Ross” Freeman are officially back in action as O.G. dynamic duo Sherlock and Watson. And this time, they’re leaving the period garb at home. Steven Moffat announced today that filming has finally commenced on Sherlock’s overdue fourth season. “Sherlock series four–here we go again!” the outgoing Doctor Who showrunner wrote in a statement. “Whatever else we do, wherever we all go, all roads lead back to Baker Street, and it always feels like coming home.”

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Co-creator Mark Gatiss — who also plays Sherlock’s stern brother, Mycroft — joined in the fun, posting a short “We’re back!” video on the show’s Twitter feed, promising the impending resumption of the titular detective’s ongoing game of wits against England’s would-be criminal masterminds.

No word on when we’ll see Season 4′s three episodes, or which vintage Sir Arthur Conan Doyle stories may serve as Moffat’s inspiration for this new round of mysteries. But the writer did tease that “ghosts of the past” will bedevil our heroes this season, a possible reference to Sherlock’s nemesis, Moriarty, who was officially declared dead in this year’s one-shot special, “The Abominable Bride,” but whose spectral presence will likely continue to haunt the great detective’s mind palace. “This is the story we’ve been telling from the beginning and it’s about to reach its climax.”

Sherlock returns to Masterpiece on PBS