When 55 Days finishes its run, Gatiss will prepare to play Mycroft Holmes, brother of the sleuth, in three episodes of Sherlock, including one he wrote; meanwhile, the second of his two Doctor Who episodes is, as we speak, being finalised in the editing suite. He would like to continue his collaboration with
Steven Moffat on both high-profile BBC1 series for as long as possible, but does not envisage any extension of his career as a novelist: this saw him produce three books about
Lucifer Box, an artist who moonlights as a spy. "I have enjoyed doing it but, absolutely honestly, it's so much more work, in terms of being labour-intensive, than screenwriting. In a way, I never really got Lucifer Box the way I wanted it to be. I think, between the three novels, there's probably a good one in there."