The urge within him is overwhelming, and Kerovan is driven to the mountains followed closely by Lady Joisan. Together they wage the final battle against That Which Runs the Ridges to protect the world from Everlasting Undeath which will take them if they fail. Recounts the struggle of Kerovan of Ulmsdale, child of the Dark and the Light, and Josian, who loves him, to understand and master the powers within them and by so doing save the world.