The premise, in which two documentary filmmakers infiltrate a mysterious cult headed by a diaphanous blonde who claims to be from the future, has the kick of Sam Fuller circa Shock Corridor. This film from director Zal Batmanglij effectively exploits our millennial ecological anxiety. We want Maggie, the group's leader, to really be from the future—she claims that we are bound for terrible upheaval, and there will be just a few survivors. The film's two best scenes are fine ones indeed (including one that makes clever use of a Cranberries song), but as the narrative builds to its climax, literal-minded viewers may find that the film doesn't make a lot of sense. If Maggie is a savior from the future, why does she behave like an abusive cult leader? But if Maggie is a charlatan, then what are her motives, and the motives of her followers?