If you are very sensitive then this book is not for you, my friend. Because it has disturbing stuffs. I felt terrific by just reading a character. Even though I'm not so sensitive but this book is something that will haunt me forever. It's really creepy and someone with weak heart shouldn't try to read it. Also if you start reading it there's no going back because the author made sure that once you start reading the novel you have to finish it.
So if you're planning to start reading this one, I'm already concerned about your post reading effects. ALL THE VERY BEST.