On a planet where technology handles everything and the government controls the rest, seventeen-year-old Natan has always been more curious than comfortable. When the atmospheric shield that has protected Aurelia for three hundred years begins to collapse, the planet descends into chaos — and a ship of impossible size rises from beneath the city.It belongs to the government. It was never meant for everyone.With his best friend Aria and a sharp, secretive boy named Ben, Natan fights to get on board before the planet becomes unlivable. But survival comes with a cost — and leaving means leaving everything, and everyone, behind.