The Fire Opal (The Lost Continent)

The Fire Opal (The Lost Continent) by Asaro, Catherine. paperback edition. ISBN: 9780373802777.

Deep in the sun-drenched desert, priestess Ginger-Sun carries the power of shape mages. And whispers abound: Is she descended from the beloved Sunset Goddess, or are her nighttime rituals filled with wickedness? Ginger herself is uncertain, until a stranger is left for dead at her feet. Thence her magic begins to burn. Fate makes Ginger the strangers wife and therefore a target for those who would murder this man to crown another—and force her magic into twisted ferocity. For unless Ginger masters her dark powers, violence will rein in Taka Mal—and in her soul.