The solar system is being spring cleaned. Under the supervision of celebrity planetary make-over decoratiste Arisotle Halcyon, the number of moons of Jupiter is being brought down to an aesthetically pleasing level.
But with eco-terrorists taking an active - and deadly - interest in the work, corrupt officials lining their own pockets, and incompetence leading to the demolition of the wrong moon, the Doctor and his companions realise that not everything is as aesthetic and innocent as it seems . . .
