'Sherlock' trailer shows more of season 3

'Sherlock' stars Benedict Cumberbatch and Martin Freeman.

A new trailer gives fans another glimpse into the third season of the BBC series “Sherlock.” 

“Sherlock,” which premiered in 2010, stars Benedict Cumberbatch as Arthur Conan Doyle’s detective and “The Hobbit” actor Martin Freeman as Sherlock’s sidekick John Watson.

At the end of the second season, Sherlock Holmes was presumed dead after appearing to commit suicide. However, it appears that is not the case. (The storyline is based on Doyle’s short story “The Final Problem,” in which Sherlock appeared to have died after falling from a ledge while struggling with his enemy James Moriarty.)

The new, short preview begins with Sherlock’s gravestone and shows Freeman, now with a mustache, and the back of Cumberbatch’s head as he enters a building. The phones belonging to several people in a room then all ring simultaneously and the screen fills with Twitter hashtags such as “#SherlockLives.”

Check out the full trailer.

“Sherlock” returns on PBS in the US on Jan. 19.