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 not suggesting that ours [series] is unique in that, but they can begin to have that depth, that gravity, they can spend some time, so it's a bit more like reading a good novel, if you like.

[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.

With any period piece I think the thing to do is forget that it's not contemporary when you're writing and to have the characters feel as much as possible like characters that you would know.

I wouldn't put myself in that bracket, but it's one of those things. I think what helps is that we [with Tom Hardey] don't socialize, we don't really know each other, we purely work together.

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.

Suddenly, after years of television being the poor relation and film being everything, it now feels like film is a conjuring trick. It's like, "Oh, my god, how are you going to do that in 90 minutes, as opposed to eight hours?! I've got so little time to do this!" It becomes an art form, in itself. Doing both helps you do each one.