Sherlock Season 4 Spoilers: Details of Antagonist Revealed by BBC Sherlock Season 4 Spoilers, Release (Air Date): While fans are excitedly sitting tight for the following period of BBC’s “Sherlock,” late reports propose that Season 4 of the hit TV arrangement taking into account Arthur Conan Doyle’s investigator stories of the same name has as of now shot in Morocco. (watch: Game of Thrones S6E8.) A