I've been seeing this book around booktube for a while now, so I decided to give it a shot. 
 And let me tell you, I was scared, not cuz its an "scary" book. No! I was scared thanks to all the bad critics this book has. I just kept reading reviews that went like "waste of time" "hate this" "not spooky at all", so I didn't had high expectations on this one. 
 But even though, I thought this was a really good book, maybe not a great one, but surely an enjoyable one. 
 The story develops fast so you really don't get bored at any part. Plus the theme is kinda catchy, but there are some parts that I didn't quite understand. 
 I like how it mixes past and present, and messes with your head. 
 The characters are good, well developed, but there's something missing in the story, and I can't really put my finger on it. 
 The only thing that I totally hate was the ending. 
 I was hoping for something much greater, and it was just "ok". 
 And, personally, I think the ending is one of the most important parts of the book, and mostly on a book that has a sequel. 
 So, I'll give it 3.5 stars. 
 I liked the story, and writing. 
 Hate the ending and the lack of explanations. 
 Let's see how the story goes on Sanctum.