Guinevere's Gift — Nancy McKenzie

On the night of Guinevere's birth, there was a prophecy that foretold she would one day be highest lady in the land and wed to a great king. But 13 years have passed, and the prophecy couldn't be further off. Guinevere is now an orphan and a ward of her aunt and uncle, the king and queen of Gwynedd. Tomboyish and awkward, Gwen is no great beauty, and nobody takes the prophecy seriously -- especially not Gwen.
But then one day Gwen meets a strange young man in the woods who claims to be part of an ancient tribe whose mission is to guard and protect her. Then she stumbles across a sinister plot brewing within the castle walls -- one she alone might be able to prevent. Guinevere is beginning to realize her destiny is more complex than it seems -- and this is only the beginning.