It’s almost cruel to report on Sherlock season 4 and the upcoming special when they’re so far away. As we previously reported, a Sherlock “Christmas Special” is due out in December 2015, and it will be followed by three new episodes. Filming on the special is set to begin in January with filming on season four happening later in the year, and the show’s co-creator Mark Gatiss told Britain’s Radio Times that “you can always expect tragedy as well as adventure,” although I’d say each season is fairly short on tragedy until the finale.
But fans of Sir Arthur Conan Doyle’s novels may already sense where the tragedy in season four might come in. Hit the jump for more, but be warned that if you’re unfamiliar with the books, and/or if you don’t want to know about the return of Moriarty (Andrew Scott), there are spoilers ahead.