Who could it be behind this door? Well, watch the teaser trailer below to find out (well, just in case you honestly didn’t know, but I doubt it.) And what is that thing on Watson’s face?!
[youtube=http://www.youtube.com/watch?v=llGXWICGsD4&w=560&h=315]
Sherlock Season 3 first episode is set to air on BBC One on October 31, 2013.
