What is the author's style in The Door in the Wall by Marguerite De Angeli?

The language of this novel tends to be formal and the monks use archaic pronoun forms. There are words used that are not common today such as wind hole, flambeaux, hosen and others. This language makes the reader feel the story is really happening in medieval times, which enhances the tone of the novel. The language does require some reference to a dictionary to determine the meaning of the text. The book is rich in opportunities to expand one's vocabulary and many of these words are listed in the vocabulary section.