To summarize it quickly, here’s the description from the back of the novel itself:
After the Detonations, the world was unrecognizable. Those who survived were fused to their surroundings, even to each other. Today, ten years later, it is Pressia’s birthday. Today she must either become a soldier or be used for target practice. Today, Pressia begins running.
The Dome stands on a hilltop, its inhabitants untouched by the apocalypse. Pures. Patridge has become suspicious of life in the Dome, the secret attempts to enhance the species, and the circumstances of his mother’s death. When he escapes to search for answers, he’ll enter Pressia’s broken world.
In an uncharted wasteland two survivors must discover the key to Earth’s destruction, or suffer the ultimate demise that still lies in its future.