I enjoyed listening to the audiobook a lot! I wouldn't call this horror though, I'd say it's quite similar to the Wayward Children series by Seanan McGuire.
Took me too long to finish this book, even considered DNF'ing it. I'm so glad I didn't. First half of the book was almost a torture for me to get through, but after that it became a magical experience. It almost made me tear up a couple of time.