The Hollow Dead is the fourth book in the Gravekeeper series, and probably my favorite thus far. I loved it so much, I read it in one sitting! It’s action-packed, a little emotional, and kind of reminds me of Stranger Things. I really love all the characters and their silly quirks, too. I can’t wait to find out what Keira and the gang are up to in the next book! I highly suggest you check out this series if you love a good paranormal mystery.