The solar system is being spring-cleaned, to improve its feng shui and attract big business back to the long-abandoned seat of Earth's empire. Celebrity decoratiste Aristotle Halcyon is heading the campaign of controlled demolition. Having swept away the Asteroid Belt and the Oort Cloud, he now plans to make Jupiter more aesthetically pleasing by removing scores of "unnecessary" moons. But the ancient satellites hold deadly secrets, as the Doctor, Fitz and Trix soon discover. With eco-terrorists planning sabotage, corrupt officials lining their own pockets and sinister forces acting on their own agendas, only the Doctor sees that millions of innocents have been set on the fast track to bloody, unbridled destruction...