Publisher's Synopsis
The Avery robots are impotent when it comes time to comply with the Three Laws. They are now facing an attack by flying intelligent aliens capable of unleashing an all-out war. Ariel is the only human on the planet capable of confronting the menace of these aliens, who are willing to blockade the city under a dome of compensating atmospheric perturbations that the robotic occupation has generated. Can Ariel prevent the closing of the dome with her in it?