Click here to listen to the interview (13:24)

For co-writers Zal Batmanglij and Brit Marling, making SOUND OF MY VOICE wasn't just a labor of love, but one of passion. Batmaglij directed and Marling stars as Maggie, the enigmatic leader of a cult who claims to have come from the future to save her followers in a film that lets the audience decide what is real and what is fantasy. When I spoke to the pair by phone on April 26, 2012, I was curious about how they had made a first-rate film for what is usually spent on catering for a mid-range film, and why the LaBrea Tar Pits were the perfect location for a decisive moment in the story. The conversation turned to the nature of belief, why people in general are both repulsed and fascinated by the idea of an apocalypse, and the odd way Marling found just the right voice for Maggie.