The Underground City — Jennifer Martucci; Christopher Martucci

We can't stay out here in the open any longer. We killed the king's son. It's only a matter of time before his people find us, before they slaughter us all. We need to leave now. We need to make it to the underground city.
Avery, June and their friends are being hunted. They need to find fuel so that they can travel across the country to the underground city, to a place where humans live safely, free from the terrors above ground. But once they make it there, will it be the idyllic paradise they imagine it to be or will it be worse than the current nightmare in which they live?
Find out in this gripping third installment of the Planet Urth series.