In my opinion, some of the best books are books that combine multiple genres. In this case, I think House of Hollow combines the fantasy genre with the thriller genre. The relationship between the three sisters reminded me of the relationship in Charmed. I hope that we get to see their relationship develop further in the book, and that they get to demonstrate the power of sisterhood. I'm also excited that the summary of the book reveals that there will be a mystery/thriller aspect to this book as well. I can't wait to read on and find out what happens.