What is the author's style in Claudius the God and His Wife Messalina by Robert Graves?

While Claudius, by the nature of his own existence as a member of the imperial family, can not but help to be involved in many of the plots and subplots unfolding around him, he nevertheless consciously strives to provide his reader with an objective view of events. His early speculation of Livia's involvement in various deaths is eventually proven true, establishing his credibility as a narrator, and rarely do his other speculative thoughts fail on the grounds of his own biases and subjectivity.