Alain, caught up by Liath as she makes her way back to her own world and time, has been returned to the present bereft of all that matters to him. And though for a while he finds refuge in a monastery, he is soon condemned to a terrible fate. His only hope of rescue lies with the Eika leader Stronghand, who has begun a campaign of conquest into the human lands. And even as these diverse forces struggle to avert total ruin, the mathematici, led by Anne and Hugh, strive to re-create the original spell which exiled the ancient Aoi, neither knowing nor caring that their magical workings could tear their world apart.