There are 4 books in the The Wicked Years series. The newest book is Out of Oz which came out in 2011.

1
Wicked

Book cover of Wicked
An astonishingly rich re-creation of the land of Oz, this book retells the story of Elphaba, the Wicked Witch of the West, who wasn't so wicked after all. Taking readers past the yellow brick road and into a phantasmagoric world rich with imagination and allegory, Gregory Maguire just might change…
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2
Son of a Witch

Book cover of Son of a Witch
Back in the land of Oz, the adolescent boy Liir was last seen hiding in the shadows of the castle after Dorothy did in the Witch. Bruised, comatose, and left for dead, Liir is tended to at the Cloister of Saint Glinda by a silent novice called Candle, who wills…

3
A Lion Among Men

Book cover of A Lion Among Men

The third extraordinary novel in Gregory Maguire's bestselling Wicked series, featuring the beloved Cowardly Lion

As civil war looms in Oz, an ancient and tetchy oracle named Yackle prepares for death. Before she can return to dust, however, the Cowardly Lion, an enigmatic figure named Brrr, arrives seeking knowledge about…

4
Out of Oz

Book cover of Out of Oz

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.…