The five Campton children are travelling to neighbouring cities by bus, desperately looking for other living humans. All they find are deserted settlements, burned forests and packs of feral dogs, until one day they discover an amusement park filled with kids, all found and gathered by Saul, the owner's son. A strange, authoritarian child who worships the park's great white shark, and whose arbitrary rules are not at all to the taste of the newcomers.