American writer Edgar Allan Poe and English writer Agatha Christie both are masters of detective novels. The former is the pioneer of detective stories and the latter is the “golden age” of detective novels. Both of them have achieved great successes and enjoyed a great reputation. The Mystery of Marie Roget and Five Little Pigs are representatives of the “armchair detective mode” novels written by Allan Poe and Agatha respectively. The former mainly uses the first person perspective and male narrative voice, and it realizes the transformation from "the first person external perspective" to "the first person internal perspective", while the latter mainly uses the third person perspective and female narrative voice, and it changes from zero focalization into internal focalization. By analyzing the differences between two novels regarding narrative perspectives and narrative voices, it shows that Edgar Allan Poe strictly upholds the "unity of effect" theory in his creation and Agatha Christie adheres to her simple feminist consciousness in her novels