A thousand years in the future, humanity has spread across the universe, colonizing a hundreds of worlds and countless more outposts. They have also established space-cities such as Novo Paolo, a.k.a. Bubbleopolis, where 30 million people inhabit a fantastic space city protected by a collection of transparent and near-impenetrable Borvonite spheres. But an unknown enemy has figured out how to penetrate those spheres and launches a devastating attack,...