The Queen of Ashes

From the back cover of the Ace Books first edition: For five years Queen Mhairi has endured a tumultuous monarchy. The Lords, hungry for power and personal gain, are divided. But Mhairi has found a new friend amid the turmoil - Lady Mordance, the widow of the Lord of Barruist. Confidant, advisor, and ally, Mordance is a welcome light among the petty lords. But darkness still looms. Spawned by a pact made by an ancient king, a malevolent plot is growing that could tear the throne from Mhairi's grasp and destroy the kingdom. A treachery to be delivered through the smooth tongue and vile witchcraft of a new and trusted friend...