When you're watching, I find two things happen. You either watch a film and it's really good and then you think, "Why can't I do that?" Or you watch a film and it's not good, and you think, "Why am I doing this?" So either way, it feels like being at work.

I'm always interested in characters who are closed down, but who open up when they choose to, rather than when they're obliged to. I think that's a very appealing thing, for an audience and just in life. I like the idea that something will say nothing, and then get straight to the point. That feels like how your heroes should be.

It's such a gift when you know who you're writing for and you know that that actor is capable of so much that you can relax a bit.

I didn't direct [the Taboo episodes]. I wrote all of them.

[The Girl in the Spider's Web] can't be anything other than a sequel, but a couple of books have been skipped, so it is different, in that sense. It's really taking a very strong central character and thinking, how do you execute this? It's quite different.

A creative person can suddenly realize it's not 90 minutes. They haven't got to do three acts, they haven't got to do the arc, but they can do other things. I think just as novellas turned into novels, I think that television series can begin to have that depth.

I think it creates so many more opportunities and pitfalls in that you are treading on fresh snow, so you're in a new place.