A mysterious accident on Pluto has left one girl mute, her father comatose, and her brother damaged and altered. But their barren world is changing around them, and secrets can't be kept forever... Terraforming - the megascale-engineering of a planet's surface to one more Earth-like - is now commonplace across the Solar System, and Pluto's is set to be the most ambitious transformation yet. Four billion miles from the Sun and two hundred degrees below zero, what this worldlet needs is light and heat. Through captured asteroids and solar mirrors, humanity's finest scientists and engineers are set to deliver them. What nobody factored in was a saboteur - but who, and why?