The Sherlock Series 4 premiere is also coming to Masterpiece on PBS in 2017.
The BBC has debuted the new Sherlock Series 4 trailer, which you can watch below.
In fact, the Sherlock Series 4 premiere arrives nearly two years after the end of the show’s third season.
The title of the Sherlock Series 4 premiere is almost certainly a reference to Sir Arthur Conan Doyle’s 1904 short story “The Adventure of the Six Napoleons” (later collected in The Return of Sherlock Holmes), swapping the French revolutionary with a more recent political figure.