The unity of effect is one of the most famous theories by Edgar Allan Poe. He insisted that a certain unique or single effect was to be wrought out before writing a story; the scene settings should be united for this kind of effect and the final goal of literature was the entire union of aesthetic in both theory and practice. In this paper, I will analyze how the scenes in The Black Cat were united to express the preset “terror” theme. The unity of effect is one of the most famous theories by Edgar Allan Poe. He insisted that a certain unique or single effect was to be wrought out before writing a story; the scene settings should be united for this kind of effect and the final goal of literature was the entire union of aesthetic in both theory and practice. In this paper, I will analyze how the scenes in The Black Cat were united to express the preset “” terror "theme.