First of all, let me say how grateful I am that I wasn't reading this at nighttime. 
 That being said, I wasn't overly scared by this but it was scary. It is a horror/thriller novel about a boy whose job is to kill bad ghosts that are still wandering around. 
 Him and his mom travel the world so he can kill particularly violent ghosts. This tradition/ job/ thing was passed down from his father who was also a ghost hunter that happened to be killed by one of them. So now, his son, with the help of a magical knife, finds dangerous entities and banishes them to the spirit world. The story starts up with the son and mother moving to a new town to find/kill a ghost named Anna. Who you may have guessed, is covered in blood! Surprise! 
 The story was well-constructed and enjoyable, leading me to binge read it once I got into it. I love the world-building here and all the information the author gave us about this occult world that fit into our own world in a very believable way. She also didn't make it all pretentious and over-indulgent, she informed us of what we needed to know and told the story. 
 My altogether favorite part of the book was the narrator himself, Cas. I don't often read books with male narrators because I honestly feel like men should stop talking most of the time. Sooooo I was surprised by how much I liked Cas. He was funny and realistic and his inner monologue was extremely entertaining. We see his feelings clearly and his reactions to the plot's developments. 
 If you're in the mood for a chilling, ghostly read, I would strongly recommend this one.