Daine sails to Cathak as part of a peace treaty delegation from Tortall. There she is amazed by strange and wondrous sights, including rooms filled with dinosaur bones and the Emperor Mage's zoo. But she also senses a darkness beneath all the gold and glitter, a darkness that lies in wait. At the same time, Daine is discovering that her own wild magic is growing again, this time giving her powers both great and terrifying.

Emperor Mage is the third book in The Immortals series, which chronicles a time when the world is invaded by immortal creatures and a girl is born with a magical gift that could restore the very balance of nature.