Techically, book 8.5 WILL be book 9, its going to pick up after book 8. I just think she named it book 8.5 becasue of how its so different from the others. Or maybe she wants the book series to end at 10 and she can't do that with only 2 more books. Or maybe she was writing book 9 and realized she won't be able to finish it in 2020, so she split it up and those are bassically one book. OR maybe she lied and it will write about the great gulon incident. OR MAYBE........ actually nevermind.