Diplomacy of Wolves

From the front flap of the Millennium HB edition: "The Wolves within - For four hundred years, the great houses of Sabir and Galweigh have battled for control of Calimekka - while each clan's wizards, the Wolves, plot in shadows to revive the hellish necromancies that once destroyed the world. Now at her cousin's royal wedding to the decadent House Dokteerak, a young diplomat named Kait Galweigh discovers a Sabir plot to ambush the entire House Galweigh. Suddenly Kait must escape an alien citadel pursued by mortal and demonic assassins. Her only hope is a secret weapon she dares not use: for Kait was born with a power so cursed that her own people will kill her if her nature is discovered. But unless Kait's deadly magic is unleashed, her mortal enemies will crush Calimekka in a reign of unholy terror..."