The Riddle: The Second Book of Pellinor

Maerad is a girl with a tragic and bitter past, but her powers grow stronger by the day. Now she and her mentor, Cadvan, hunted by both the Light and the Dark, must unravel the Riddle of the Treesong before their fractured kingdom erupts in chaos. The quest leads Maerad over terrifying seas and vast stretches of glacial wilderness, ever closer to the seductive Winterking—ally of her most powerful enemy, the Nameless One. Trapped in the Winterking's icy realm, Maerad must confront what she has suspected all along: that she is the greatest riddle of all.