Thermopolis has launched into Orbit, but Rick Omicron was left behind on Earth. Now, he needs to find a way to come home. As he wanders through the desolation of the world, Rick finds an unusual city, surrounded by three concentric rings of impenetrable walls with a tower in the center that is a carbon copy of his native Citadel.Once Rick finds a way to pass the walls, he has to be swift and hide from the many dangers of a city that constantly changes itself in mysterious ways that intensify the explosions of madness among the locals...What are the other secrets hidden behind the immensity of the city walls? What is the true purpose of such citadels? This is where Rick Omicron will finally understand the true depth and magnitude of the plans laid by the ancients.