Brit Marling and Zal Batmanglij returned to Sundance this week with 'The East,' the follow-up to the pair's powerful fest favorite, 'Sound of My Voice.' The first trailer has been released, and it seems to exist in familiar territory.

'Sound of My Voice' told the story of two journalists trying to infiltrate a cult led by the charming and disarming Maggie, played by co-writer Brit Marling. The film, directed by Zal Batmanglij, was a huge hit on the festival circuit, and now the pair are back with 'The East,' which premiered at Sundance this week.

'The East' follows similar themes, but the trailer indicates a film that's pure thriller -- a young woman and employee of a private intelligence company goes undercover to infiltrate an anarchic group, but once there she finds herself in way too deep, and begins to question her own motives and desires as she participates in the group's campaigns and missions.

The film stars Ellen Page, Brit Marling, Alexander Skarsgard, and Patricia Clarkson, and while it doesn't have a release date yet, it should be hitting theaters in some capacity before the end of the year, courtesy of Fox Searchlight, who also distributed Marling's previous films 'Sound of My Voice' and 'Another Earth.'

Check out the first trailer below:

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