Something terrifying is out there that must not be seen. One glimpse and a person is driven to deadly violence. Five years after it began, a handful of scattered survivors remain, including Malorie and her two young children. Living in an abandoned house near the river, she has dreamed of fleeing to a place where they might be safe. Now that the boy and girl are four, it is time to go. But the journey ahead will be terrifying --- one wrong choice and they will die. And something is following them.