After their fierce battle with the zoids, York and Belle must journey down to the next level of the Biosphere, where all the plants and animals for the journey from Earth were kept. Since the zoid uprising this level has become a deadly mix of enormous carnivorous plants, mutated insects and animals that have evolved in terrifying ways. York and Belle have no choice but to fight their way through this dangerous landscape to reach the centre of the ship, where they will finally solve the mystery of the zoids.

Paul Stewart and Chris Riddell are the geniuses behind the phenomenally successful The Edge Chronicles, Muddle Earth, The Far-Flung Adventures and the Wyrmeweald trilogy. They both have hugely successful careers separately, Paul as a writer of children's books and Chris as an illustrator and cartoonist for the New Statesman and the Observer. They both live in Brighton, where they met picking up their children from school. Together they have sold over half a million books.