For me 3,5 stars rounded up to four stars.
This is the current ending of the series and I don't know if there will be more books. I hope so though because we have not yet concluded the main story.
In general I really liked the book. We have an infested hotel with a very creepy atmosphe and a charming old hotelier as a side character. The main character as always is our naive sometimes not so bright librarian Sadie. She comes to the hotel to solve the mystery about her mother for good. There she meets Jojo. A young lady who ran away from her life basically and is targeted by the hauntings of the hotel. The hauntings remind me of the movie Silent Hill. All in all I had a good time with this book.
The thing about this series is, that the individual books are between 3 and 4 stars for me but as a whole it works really well. Therefore I would give the series a solid 5 stars. It kept me engaged constantly. I hope we will get a final volume to conclude the main stroryline.