Seattle is beautiful. You look at the sky and it's one of the most beautiful skies in the world, and then there's the Puget Sound, which will kill you, if you fall into it, but it's also beautiful. Seattle is a city of contradictions. It's the most liberal and most literate city in America, and it has Starbucks and [Bill] Gates, but it's also where the Green River killer hunted women and where the runaway population is just shocking when you walk the streets. Within the same city, there's darkness and light.

I've always been kind of drawn to the extremities of human nature. I wrote my first screenplay when I was 16. The initial idea was a friendship between two prostitutes, and I spent time with a vice squad guy in Cincinnati who brought me to a brothel and gave me the rundown on how street prostitution works.

I'm really trying to just keep this internal, and be faithful to the story and the characters, and keep 99.9% of my brain there, serving the story. It's a great network. It's the golden network of cable, so it's totally an honor to be there and tell this story, but I try not to think about anything beyond that.

It was a very, very intense and long casting process [for The Killing] because we really had to find the right people who could carry the weight of this story, who had the chops and who had the spirit, where they could bring in so much of their own selves to these characters. So, the casting process took many months.

I think it is the hardest thing in the world. I'm endlessly intrigued by what human nature is capable of, both the horrible things we are capable of and also the heroic things. I'm really interested in exploring that side of human nature.

I am endlessly fascinated by this notion that everyone has a secret. Some of our secrets are tiny, small things, and some of them are huge. Given that reality of the human condition, that's what our characters will go through. There will be some things where you'll just be like, "What the hell! How the hell did that happen?"

Before I write anything, before I create any assumption in my mind about what it's like to be in that world, I go out there first. I'm very drawn to darkness and light, very drawn to cop drama, because there are very few places besides war and murder and a homicide investigation where you see the extremes of human nature - the darkest crevices and cracks in what people do to one another.