Veil took her time meticulously creating each character on the page. Each person had a full backstory and a personality and experiences that may their actions understandable. Although much of the book is character development ultimately that serves the story well.
The supernatural portion of this story draws heavily on the sibling relationships, and the trauma that they experienced together and alone. I think this was an excellent foundation for the story. Discussing this aspect further would be a light spoiler, but I do think that this is unique enough to set this book apart from others using similar plot devices.
The suspenseful part kept me guessing, but the pacing for me was off. This book isn’t especially long, but it feels long at some point. I liked the interpersonal relationships and the strong voices of the characters. The part of me thinks that there is room to remove some of it and increase, the pace to something more medium than slow. 
There are parts of this book that feel like a fever dream. This is the type of book that sometimes feels like a movie the writing was very descriptive and they were times when reality was very thin.