People live underground after a catastrophe that destroyed life on the surface. The inhabitants of a large cave containing an entire city know only that they are all the last survivors, and the underground civilization has also collapsed. They created a cozy little world, revived some ancient technologies, they don’t need anything else. But Liam Lee Kadami, a young guy who asks questions and seeks answers and is ready to turn the whole city upside down for his own purposes. He will find a robot institute, lost megacities, unite quasi-states, learn all the secrets, and the computer god will tell him the way.