I unfortunately ended up skipping a lot of this book. I think the writing itself is excellent, it's just not the right story for me.  I found it a bit slow at times, and I was hoping it would pick up the pace. 
I think it was a very original story, especially not knowing the perspective of the person in the flashbacks, nor who Luna really is. 
I think the book is good for readers who lean towards the horror genre (though this definitely isn't a horror story), so perhaps more gothic? 

Appreciate the opportunity from the publisher to read this book. All opinions are my own.