The Girl of Fire and Thorns by Rae Carson

Once a century, one person is chosen for greatness. Elisa is the chosen one. But she is also the younger of two princesses, the one who has never done anything remarkable. She can’t see how she ever will.

Now, on her sixteenth birthday, she has become the secret wife of a handsome and worldly king—a king whose country is in turmoil. A king who needs the chosen one, not a failure of a princess.

And he’s not the only one who seeks her. Savage enemies seething with dark magic are hunting her. A daring, determined revolutionary thinks she could be his people’s saviour… Read more.