Fire and thorns trilogy

"Hero. Foreigner. Queen. Elisa, at the age of seventeen, is all three. And all three draw enemies. Faced with assassins, court politics, and the threat of civil war, Elisa despairs of being the ruler her people need. Her only hope is the Godstone. She must master its power once and for all. She finds clues hidden in a long forgotten--and forbidden--scripture. Accompanied by a one-eyed warrior, an enemy defector, and the man she is falling in love...