What is the author's style in Post Captain by Patrick O'Brian?

The novel is told from the third-person, limited, point of view. The narrator is reliable, entirely effaced, and unnamed. Jack Aubrey and Stephen Maturin, the main characters, are the protagonists and central figures in all of the scenes in the novel. The narrator divulges some internal thoughts of the two protagonists, but not of other characters. The majority of the story is told through action and dialogue; revealed thoughts are very infrequent and are used for characterization rather than plot development.