To the Point
The Raven Boys is a book in which fantastical things happen and the supernatural is a given, but that doesn't mean that it's full of flowery language. Instead, the writing style is matter-of-fact and to the point. Even crazy things (like finding out that one's best friend is a ghost or stumbling into a magical tree trunk) are written about in a straightforward, observational manner:
Blue was more distressed than she thought she would've been by the fact that Noah was dead. From talking to the police, it was clear that he'd never been alive, at least not since she'd met him, but still, she felt a curious grief over it. (30.1)
By presenting talking trees and long-dead friends in such a matter-of-fact style, the reader is able to more readily suspend his or her belief. It's easier to swallow all these wild, fantastical elements when it's presented to you in such a straightforward way.