In episode one of this new series, written by Mark Gatiss, Sherlock waits to see where Moriarty will make his posthumous move.
While we wait, watch the newest Sherlock Season 4 trailer below, and stay tuned for more.
I mean, the success of Doctor Strange is not going to make Benedict short of work.
Benedict Cumberbatch returns as Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft, Rupert Graves as Inspector Lestrade, Una Stubbs as Mrs Hudson, Amanda Abbington as Mary Watson and Louise Brealey as Molly Hooper.