Son of a witch

Liir hid in the shadows of the castle after Dorothy did in the Witch. Left for dead in a gully, the teen is shattered in spirit and body. But silent novice Candle tends him at the Cloister of Saint Glinda, and wills him back to life with her music. What dark force left Liir in this condition? Is he really Elphaba's son? He has her broom and her cape - but what of her powers? Can he find his supposed half-sister, Nor, last seen in the forbidding prison Southstairs? Can he fulfill the last wishes of a dying princess? In an Oz under new and dangerous management, can Liir keep his head down long enough to grow up?