LONDON, April 6 (UPI) -- Sherlock screenwriter and cast member Mark Gatiss confirmed Wednesday that production has begun on Season 4 of the contemporary detective drama.
"It begins... Filming for series 4 is underway! #221Back," said a post on the British show's Facebook page.
The message accompanied a brief video clip featuring Gatiss -- who plays Mycroft Holmes -- holding a black-and-white clacker and declaring: "We're back. The game is on."
The series stars Benedict Cumberbatch and Martin Freeman as sleuths Sherlock Holmes and John Watson. Season 3 wrapped in January 2014. A one-off TV movie starring Cumberbatch and Freeman and set in Victorian London aired this past January.