Is the charmingly evil antagonist James Moriarty back for season four of Sherlock? We’re not totally sure, but it seems pretty damn likely he has a big plan up his well-tailored sleeves, if the trailer from Sherlock’s upcoming fourth season is any indication. What’s certain, though, is that things have never looked bleaker for the Baker Street boys (Benedict Cumberbatch and Martin Freeman), as they do some sleuthing while butting heads with a new villain played by Toby Jones with great panache. But seriously, where you at, Moriarty? Sherlock will return to PBS on January 1, and you can watch the original teaser below.