Gatiss also spoke about the lengths they go to in order to keep certain twists a secret, watermarking absolutely everything.
Whilst the fourth season of Sherlock has been airing on BBC One, Mark Gatiss has played a rather active role in defending the show, most notably through writing a now-infamous poem.
The writer, who also plays Sherlock’s brother Mycroft, has now defended the show’s often challenging plot, filled with twists and turns.
However, the BBC’s attempt to keep season four’s finale twist has failed after a Russian version of the episode leaked online.