What was the book sky about by hanneke ippisch?

There is no known book called "Sky" written by Hanneke Ippisch. It's possible there's a misunderstanding about the title or author, or that the book is obscure or not widely known.

To help me find the right book, could you please provide more information?

* Is there a specific year of publication you're looking for?

* Do you know anything about the genre of the book?

* Do you remember any details about the plot or characters?

With more details, I might be able to identify the book you're looking for.