The following post is from our advertiser, Fox Searchlight Pictures. Peter and Lorna, a successful, young Los Angeles couple, decide to delve into the underworld of a cult in the San Fernando valley to get the big story that will kickstart their careers as investigative journalists. At the center of the group is an mysterious young woman named Maggie (played by Brit Marling) who never leaves the basement of the dwelling but nonetheless wields terrifying…