king's Dragon Crown of Stars book 1

The Kingdom of Wendar is in turmoil. King Henry still holds the crown, but his reign has long been contested by his sister Sabella, and there are many eager to flock to her banner. Internal conflict weakens Wendar's defences, drawing raiders, human and inhuman, across its borders. Terrifying portents abound and dark spirits walk the land in broad daylight. Suddenly two innocents are thrust into the midst of the conflict.
Alain, a young man granted a vision by the Lady of Battles, and Liath, a young woman with the power to change the course of history. Both must discover the truth about themselves before they can accept their fates. For in a war where sorcery, not swords, may determine the final outcome, the price of failure may be more than their own lives.