Aliens Made Me Do it!

On a deeply ordinary day Hillman finds that Cassiopeia and her android Silver have landed their space ship in his back garden and crushed his dad's car. Cassiopeia is a princess who claims to rule galaxies, only she's shrunk her armada and needs help, or Perseus, her galactic enemy, might defeat her AND destroy this manky planet, just to show he means business. Can Hillman, an eleven year old boy, and Cassiopeia defeat Prince Perseus, Lord of the Five Spirals, Admiral of the 1st Attack Fleet, Commander of the Order of Zarg, and more recently winner of the Alpha Centauri Award for Best-Dressed Galactic Despot? We'll see. Perhaps, after many twists and turns.