This wasn't quite a 4 star book but I did round it up. Overall, this was an interesting book. I liked the mysterious factor of where their sister Avery was. Spoiler I liked that the haunting was actually them in the present haunting their past selves. I know this is a young adult book and I'm not it's target audience, but I did find some things bordering on teen angst.
If you like haunted house books or books that do a slight twist on the stereotypical haunted house I'd suggest this.