The Mirror of the Worlds is the second in the Crown of the Isles trilogy, which will conclude the epic Lord of the Isles series.   The Fortress of Glass  began the tale of how the new kingdom of the Isles is finally brought into being by the group of heroes and heroines who have been central to all the books in the series: Prince Garric, heir to the throne of the Isles, his consort Liane, his sister Sharina, her herculean sweetheart Cashel, and his sister Ilna.    The powers of magic in the Isles have flooded to a thousand-year peak, and even local magicians can perform powerful spells normally beyond their control. Fantastic forces from all angles threaten, trying to keep Garric and his companions apart to thwart the reunification of the Isles.   Now the world itself has suffered a magical upheaval. The ocean has receded and the Isles have become the higher ground of a newly formed continent. But the new continent is a patchwork of geography from the dispast and future, peopled by creatures from all times and places. Garric and his companions must now struggle for the survival of humanity.