What is the author's style in The House of Dies Drear by Virginia Hamilton?

The novel is written in the third person point of view with Thomas Small as the narrating character. Thomas tells the story from the viewpoint of a child who has just been forced to move from the only home he has ever known in order to live in a historic house several states away. Thomas is a smart, curious young man, but he does not have the same insight as some of the adults in the novel. For this reason, the reader does not learn the truth about the haunting at the house of Dies Drear until later than some of the other characters because Thomas does not put the facts together until much later in the novel.