The Priory of the Orange Tree by Samantha Shannon
Book Description
Ead Duryan is an outsider at the court. Though she has risen to the position of lady-in-waiting, she is loyal to a hidden society of mages. Eid keeps a watchful eye on Queen Sabran the Ninth by secretly protecting her with forbidden magic. Meanwhile, the divided East and West refuse to parley, and forces of chaos are rising from their sleep.