Well, I would probably recommend Momo or (sometimes called also The Grey Gentleman) by Michael Ende.
Also for all OUAT fans might be the original Neverending Story an interesting read. It’s very different compared to the movie and a big story about telling stories. But I would recommend too check before buying/borrowing it, if the version of the book is printed with red and green letters, which represents the two different lands.
I heard that some of the English versions just use italics instead. What a crime.^^
Anyway also fr those who are interested in some fairytales should check out “The Happy Prinve and Other Tales” by Oscar Wilde or some fairy tales written by Wilhelm Hauff, a German novelist whose fairy tales are very popular in Germany.
“There were thousands and thousands of forms of joy in the world, but that all were essentially one and the same, namely, the joy of being able to love.”