What is the author's style in The Looking Glass Wars by Frank Beddor?

The author uses language in the novel that is both educated and simple. The author's novel is intended for a young audience and many of the main characters are young people, therefore the author uses language that is uncomplicated and authentic to his characters. However, there are some characters who are older and better educated, therefore some of the language used when the author tells the story from their point of view is more sophisticated, again creating authentic characters.