What is the author's style in The Murder of Roger Ackroyd by Agatha Christie?

The Murder of Roger Ackroyd is a fast paced, action driven story, nearly devoid of long expository paragraphs or fancy metaphors and descriptive imagery. The story instead thrives on suspense and quick unfolding of information and action. The narrator uses simple, yet formal language, like the language of high-class people. The language is straightforward and rarely figurative.