Chronicles of Narnia series
The Magician's Nephew
By C.S. Lewis
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Classic isekai, before isekai was a thing people said. A rare "kids book" grown-ups can talk abuot with confidence, right up there with Harry Potter.
Book two
The Lion, the Witch and the Wardrobe
Book three
The Horse and His Boy
Book four
Prince Caspian: The Return to Narnia
Not the last book in the series, but the last I remember reading.
