The humans are weak and vulnerable. Soon the beasts that share their stone-age world will kill and eat them. To save his tribe, Stopmouth must make his way to the Roof, the mysterious hi-tech world above the surface.But the Roof has its own problems. The nano technology that controls everything from the environment to the human body is collapsing. A virus has already destroyed the Upstairs, sending millions of refugees to seek shelter below. And now a rebellion against the Commission, organized by the fanatical Religious, is about to break.Hunted by the Commission’s Elite Agents through the overcrowded, decaying city of the future, Stopmouth must succeed in a hunt of his own: to find the secret power hidden in the Roof’s computerized brain, and return to his people before it is too late.Peadar Ó Guilín has followed his extraordinary debut The Inferior with an equally original and pulse-racing sequel in which human primitivism collides with futuristic technology.