Joshua Marston’s first film, 'Maria Full of Grace,' won the Audience Award at the Sundance Film Festival. His second, 'The Forgiveness of Blood,' won Best Screenplay at the Berlin International Film Festival. But his third, 'Complete Unknown,' is perhaps his most ambitious yet.

Written with Julian Sheppard, the film stars starring Rachel Weisz and Michael Shannon, and explores the life of Alice Manning, a woman with multiple identities and a remarkable past.

We spoke with Marston about the idea for this unique character study, the underlying theme behind the film, and why screenwriters need to get out more.

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