Wicked, tome 4
Gregory Maguire2011

The marvellous land of Oz is knotted with social unrest: The Emerald City is mounting an invasion of Munchkinland, Glinda is under house arrest, and the Cowardly Lion is on the run from the law. And look who's knocking at the door. It's none other than Dorothy. Yes, that Dorothy.

Amid all this chaos, Elphaba's granddaughter, the tiny green baby born at the close of Son of a Witch, has come of age. Now, Rain will take up her broom in an Oz wracked by war.
Out of Oz is a magical journey rife with revelations and reversals, reprisals and surprises - the hallmarks of the brilliant and unique imagination of Gregory Maguire.

Titre original : Wicked Years, book 4: Out of Oz (2011)