I can't believe we're still alive. I can't believe we've made it this far. With the army I've grown, thousands of Urthmen have fallen. But more await us. More are coming. It's only a matter of time before they reach us, before the King's army finds us. And when they do, we'll be outnumbered, faced with an unwinnable battle.I must find a way to keep my people—my sister and loved ones—safe. I cannot allow them to die.After winning the battle at the underground city, Avery and her soldiers have waged war against Urthmen. But word that the King has dispatched his army changes everything. She and her people must scramble to find a stronghold, a task that's seemingly impossible.And that's not the only challenge facing her group.Betrayal threatens to destroy everything. Will it divide the human alliance before the King's army arrives, or will humanity prevail? Find out in this riveting fourth installment of the Planet Urth series.