I found this book to be similar to the much loved Stranger Things and Coraline, with the unique Sci-Fi atmosphere in a modern day urban setting, with rich world building and a well constructed plot. I enjoyed the idea of various other versions of the world (hence why I thought of Coraline) and I enjoyed the characters. The pacing was fairly fast, however the ending let me down a bit as it seemed like the whole book contradicted itself.