In 2045, little remains of Earth. The aliens arrived a decade ago, eradicating most human life in the process. No one knows why they did it or why they are here. Their vessel stands out at sea, silently stretching up into the clouds while the survivors of Earth fight over what's left. England is reduced to two settlements: Oxford, a beacon of hope and prosperity; and Chard, a rebel encampment. While they squabble at a distance, a girl stumbles across a secret that could turn what's left of the world upside down. But there is far more at risk than the humans know.