Creating a world that reflects the inner voyage of our characters was really important. Also, because this isn't a black and white show, and this isn't about bad guys and good guys, but it's about good men being capable of bad things and vice versa, I wanted to be in a city that had contradiction.

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.

By not foretelling the ending to yourself, as a writer, you're able to open up the canvas and say, "I'm going to go here. I'm going to go there." It's just a little bit more freeing than a stand-alone procedural, where you work backwards from the end.

And as cynical and jaded as many have become, you see the heroic nature of cops, who put aside a lot of their own personal concerns and their families to speak for the dead, which is a sacred thing. Over time there is this thing in them that is very powerful and interesting and provocative to me.

Because we spent so much time in the writer's room, not even talking about where it goes, but just who the people are in our world, we could find all those unexpected moments and twists and turns that we didn't even see ourselves.

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.

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?"