A new teaser for “Sherlock” Season 4 shows Benedict Cumberbatch’s titular character in a dark place.

“The roads we walk have demons beneath and yours have been waiting for a very long time,” the preview begins with a voiceover.

“The Six Thatchers” is the new episode’s title and it marks the first new episode of Sherlock since the hit series’ 2015 Christmas special, “The Abominable Bride.” In fact, the Series 4 premiere arrives nearly two years after the end of the show’s third season.

Watch the brand new trailer for #Sherlock series 4 below.

Sherlock is written and created by Steven Moffat and Mark Gatiss, and inspired by the works of Sir Arthur Conan Doyle. It is produced by Sue Vertue, and the executive producers are Beryl Vertue, Mark Gatiss and Steven Moffat for Hartswood Films, Bethan Jones for BBC Cymru Wales and Rebecca Eaton for Masterpiece. It is distributed internationally by BBC Worldwide.

The fourth series of “Sherlock” will premiere on Jan. 1, 2017.

For more information on Sherlock and MASTERPIECE on PBS, visit http://www.pbs.org/sherlock