This is *mostly* good. I liked that there was a twist on the typical horror trope. However, I was rather disappointed that Anna and Cas's relationship devolved so quickly and things just started happening just cause. The majority of the book was spent building up this complex story and then that complexity that I'd been enjoying, fell apart not long after they started interacting.
The story itself is interesting and I'm definitely looking forward to reading the sequel, but I'm hoping the author picks up the depth of writing they started with rather continuing with how shallow things felt towards the end.