We are approximately one month away from the return of Sherlock Holmes.

Indeed, contrary to the scene that concluded Sherlock Season 2, this legendary detective is alive and well on the beloved BBC series, which returns to British airwaves on January 1 and American television screens on January 19.

And in the first full-length trailer for Sherlock Season 3, we're treated to new scenes from the drama, which include a couple great reactions to Sherlock's resurrection, along with a raised threat level in London and the reveal that Watson has moved away from Baker St.

He has also grown a mustache. Check out the preview now...