The Patchwork Girl of Oz: Patching Together a Story
In addition to Oz now having imperfections, there is another break in the series pattern.
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The Emerald City of Oz, Thrilling (?) Conclusion (?) of L. Frank Baum’s Oz Series
For the grand finale, the diabolical Nome King returns.
The Road to Oz, Book Five of the Oz Series
Dorothy meets a vagrant, the shaggy man. “Money makes people proud and haughty; I don’t want to be proud and haughty. All I want is to have people love me.”
Dorothy and the Wizard in Oz, the Violent and Scary Fourth Book of the Oz Series
Belying the Wizard’s earlier timidity, this book shows off the wily, pitiless, and courageous side that must have allowed him to survive up against the witches.
Ozma of Oz, the Third Oz Book and Source Material for Return to Oz
Dorothy joins Ozma on a journey to free the Royal Family of Ev from the diabolical Nome King, Roquat of the Rocks.
The Marvelous Land of Oz, the Strange (Transgender?) Sequel to The Wonderful Wizard of Oz
The Marvelous Land of Oz keeps the action in the titular magical region, no isekai involved.