In an Absent Dream by Seanan McGuire
Would you look at this amazing cover! This is the prequel to the Wayward Children Series that begins with Every Heart a Doorway. This series came recommended from one of the many book podcasts that I listen to and I can't agree more. It's an amazing series full of twists and turns, bad fairy tales, and teenage angst. I found the series very imaginative and compelling and I can't wait to get my hands on this when it comes out in January 2019.
Ugh. That's so far away.