DNF at 40%. It took 30% for anything to happen. I persevered a little further but I just couldn't continue. At 40% I'd want to have some connection with a character, or the story, or something. But there wasn't anything making me want to read on. The idea of two souls living in a single body, switching places between day and night, sounds very interesting, but the world this story is set in wasn't for me. The pace is just too slow. 

Thank you to the publisher and NetGalley for the ARC of this book, in exchange for an honest review.