Twins Adam and Adriana Carver couldn't be more different these days, but they are forced to spend time together on a family vacation in a remote New England village. Though the neighborhood looks charming, the locals are spacey and distant. They seem barely able to speak. Soon the twins' parents begin forgetting everyday things—the locations of keys and parked cars. This quickly escalates into something far more troubling. As the adults start losing their core memories, the twins must hunt down the nightmarish cause of this tragedy. But the monsters in this peaceful seaside community prove far darker and more threatening than anything they might have imagined.