Out of Oz is Gregory Maguire's fourth and final volume of The Wicked Years, the fantasy series that spins off from The Wizard of Oz, and began with the musical-spawning Wicked. The original book retold the familiar story from the point of view of Elphaba, the Wicked Witch of the West, and was a clever idea well-told. Following its success, I felt the second and third books, which took up the stories of her son Liir and the Cowardly Lion Brr respectively, came across a bit like cash-ins, stories that didn't necessarily need to be told. Out of Oz takes things full circle to another green-skinned girl, Elphaba's granddaughter Rain. The final volume is quite epic in scope but feels much more sure-footed than the middle sections of the sequence. Rain variously comes under the protection of Glinda, Liir, Brr and other characters from the series in a political fable that takes in a war between Oz and Munchkinland, and after a couple of wobbles in the last two books this one ends the series satisfyingly.