"Sherlock" reveals season 4 episode titles

Time to start deducing, “Sherlock” fans.

The popular BBC drama has dropped a few more clues about the upcoming season, letting fans know some -- but not all -- of the titles for the upcoming episodes. 

• Things look grim in the trailer for season 4 of "Sherlock"
  

While last year’s Emmy-winning standalone Christmas special, “The Abominable Bride,” offered a taste of Benedict Cumberbatch’s notoriously antisocial detective, there haven’t been new regular episodes of the series since early 2014, meaning three years will have passed by the time the fourth season debuts next year. 

So what can fans look forward to? More mysteries, if the cryptic titles announced by the series’ Facebook page are any indication. The first two episodes will be called “The Six Thatchers” and “The Lying Detective,” while the name of the third and final installment of the season is still being kept a secret due to potential spoilers. 

• Benedict Cumberbatch was "too busy" for the "Absolutely Fabulous" movie
  

The new season of “Sherlock” is set to debut on Jan. 1, 2017 in the U.K., though no U.S. premiere date has been announced yet.