The Story Hunter - The Weaver Trilogy, #3

Redeeming the past is a fatal quest. In the wake of a deadly coup, the capital city of Urian has descended into chaos. Heartbreak and bloodshed await Tanwen and her friends as they discover the unlikeliest leader now rules Tir. If they want to save the realm, Tannie and the Corsyth weavers must rescue Queen Braith and unmask the Master, ending the strife once and for all. But the success of their hunt depends upon an ally no one trusts.
The Master has a new target in sight: fragile, trauma-scarred Digwyn, whose unique weaving ability could turn the tide of any war. When the desire for vengeance proves too powerful for Digwyn to resist, Tanwen must face a terrifying truth: the fate of Tir rests in the hands of a volatile, shattered girl.