Gregory Maguire: Elphie

Young Elphaba is destined to be a witch, she bears the markings from childhood. But what happened before her powers took hold?
Elphie is a girl like any other and no other. Nothing like her parents - one beautiful, the other pious - nor her saintly sister, Nessarose. Her skin is green, her mind is cunning. One day she will command this strange and wonderful world. For now, her journey is just beginning.
The road ahead is full of lessons and heartbreak, the first bruising attempts at friendship - and tantalising whispers of magic.
It will lead Elphie to the doors of Shiz University, and to the girl who will change her life forever...