Shelley is back on Earth. But where is her grandfather and the stolen Heartstone? And who is the sinister Dr Leith? The Athmadites are closing in, and a dithery Englishman is the only person who believes her story. In fact he is the only person who believes she is sane.Meanwhile Quickblade was meant to rescue the prisoners in the Dark Labyrinth, but now he needs rescuing himself. His only hope is a blue fungus addict called Moonwit - and a strange invention built by Flash and the Boy Raiders.The Boy Raiders set off on Biteback, their most daring raid of all time, while Shelley and Quickblade seek to return the Jewel to the Tree. Their way leads to the bottomless Springs of the Wouivre, where even the Frozen Army cannot help them...