What happens when a prophecy goes wrong? The fabled Storm Child, bearer of the white magic and most recent in the line of lost wizard kings, is not quite what everyone was expecting. For one thing she's a girl. And girls can't be wizards. Can they? And just what is the Keystone, which is rumoured to hold unimaginable power? Farmer's daughter, Jo Hooper, sets off to the City of Chairnin hoping to find the answers to all these questions and more. She faces peril in the form of the tyrannical Denney, Lord-Protector of Chairnin and his dangerous right hand man, the High Priest of Ishania. They will stop at nothing to gain total control of Chairnin and the immense power of the Keystone. The trouble is...no one knows where it is. Struggling to come to terms with her own special gifts, Jo soon finds herself on a quest to hunt down this magical tool. She has the help of some new friends - a Seer, two young wizards and an exiled High Priestess, to name but a few. What roles they play become more apparent the closer Jo gets to the Keystone - and the closer the realm gets to the battle for Chairnin that will decide the fate of them all.