It’s unclear exactly what’s going on, but Sherlock looks constantly off his game and unnerved — something he rarely ever is — through the whole trailer.
This new Sherlock trailer may be brief, but it further sells the idea that shit is going down in this season.
Some sort of life or death situation is coming, with Sherlock clutching a gun in a room with John and Mycroft in a few frames.
It looks like there are some serious stakes, though everything is being kept intentionally vague.