In an interview with the Telegraph, Gatiss revealed:
“I’m in the midst of that right now – I broke off to come here today, in fact, but I’m hoping to finish the script tonight.”He added:
“It has been a tough nut to crack, but I’m delighted with how scary it is. I can’t say any more than that.”
After last year's Robot of Sherwood, Gatiss looks to be writing a scarier episode for the show.