This book was a rollercoaster ride. There were times I couldn’t put it down and other times I couldn’t get myself to pick it up. 
The last maybe third of the book flew by for me. I had a few predictions on what the twist would be and I didn’t fully figure it out, which is always nice. 
It loses a few points for me just because I’m not a big fan of what the final twist was in books

(i.e. a character being a ghost but somehow one special person can see them)

but I thought that for the “trope” (if you can really call it that), it was well executed, well explained, and kept me on the edge of my seat towards the end.