Five children, a deserted city—and a deadly enemy. In the abandoned town, the children have established a new home and organized a life for themselves. As they prepare for a trip to other cities in an attempt to determine the extent of the phenomenon that saw everyone else vanish, they encounter and learn to deal with the problems of an existence without adults. Until one day a tall, knife-wielding figure appears, and their dream of finding someone else suddenly turns into a nightmare.