Peter Sarsgaard, <i>The Killing</i> Peter Sarsgaard, The Killing

The Season 3 premiere of The Killing introduced viewers to Ray Seward, an inmate who is 30 days from being executed for brutally murdering his wife. But did he actually do it?

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"Evil is something that I think is almost separate from people," Sarsgaard continues. "I don't know anything about Hitler except that he was responsible for an enormous number of people dying, and so I just think of that as evil. I think of the thing that happened around him and not just him. .... There's good and bad in the universe, and they're at war with each other. Sometimes you participate in one side and sometimes you participate in the other side. People swing back and forth."

As such, look for Seward himself to do a great deal of swinging back and forth this season. "In the absence of an abundance of love in his life, the thing that is the most intact in him is his mind," Sarsgaard says. "I think it's his strongest weapon. ...  The smartest person in the world knows you have to be adaptable. There's no master plan that ever works."

So, what is Seward's plan? Sarsgaard, who says he was a fan of the first two seasons before he was offered this role, promises it will keep viewers guessing in classing Killing style. "One of the things that I really like about Veena [is] the way she's ... pissed off people along the way," Sarsgaard says with a laugh. "Everyone who's watched this show knows that anything could happen, including not knowing. What I was really drawn to was knowing that the rug had already been pulled out from [under] everyone so many times and in so many different ways that hopefully people would stop trying to figure it out. She's trying to get people to pay attention to something more complicated and more interesting."

The Killing airs Sundays at 9/8c on AMC.