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'Sherlock' to return with special, 3 episodes

The British detective and his loyal friend will encounter more mysteries in Season 4, though shooting will not begin until January.

Martin Freeman (left) as Watson and Benedict Cumberbatch as Holmes. BBC One

The mystery of when the hit BBC drama "Sherlock" returns is finally solved.

The popular series starring Benedict Cumberbatch as Sherlock Homes and Martin Freeman as Dr. John Watson will return with a special and three new episodes for Season 4. Shooting is set to begin in January.

"Of course, it's far too early to say what's coming, but we're reasonably confident that the very next thing to happen to Sherlock and John is the very last thing you'd expect," co-creator, writer, and executive producer Steven Moffat said Wednesday in a press release.

One thing fans were not expecting was an ominous "Miss Me?" tweet and image from BBC One of Season 1 nemesis Jim Moriarty, played by Andrew Scott. That same image perplexed Sherlock as well during the Season 3 ender. Show creators promise the next season of "Sherlock" will go into uncharted territory.

Season 4 will take Sherlock and Watson into "deeper and darker water than ever before...The Game is on -- again!" co-creator, writer and executive producer Mark Gatiss said in the release.

"Sherlock" airs on PBS in the US and on BBC One in the UK.

Is Moriarty truly back to torment Sherlock, or is this a clue from the grave? BBC One