The Shadow Reader by Sandy Williams

Any hope for a normal life is shattered when she’s captured by Aren, the fierce and uncompromising rebel leader. He teaches her the forbidden fae language and tells her dark truths about the Court, all to persuade her to turn against the king. Time is running out, and as the fight starts to claim human lives, McKenzie has to decide once and for all whom to trust–and where she ultimately stands in the face of a cataclysmic civil war.