Sarah and her family are traveling to a new world, Manias, a planet that holds many secrets. Sarah discovers that below the surface lives a race if beings call W'Mbi, who have been there for thousands of years. She makes friends with one of these new people, Y'Sho, and together they explore the web-like tunnels below the surface. However, there are W'Mbi who do not wish to return the surface, and live with the humans, and they will do what they need to do to stay underground.