What is the author's style in The Purloined Letter by Edgar Allan Poe?

Many critics agree that with tales of ratiocination like "The Purloined Letter," Poe earned the title of father of the modern detective story. When Poe introduces Dupin, he provides very little information about his background. He and the narrator sit in the dark, smoking their pipes. When the Prefect visits him to talk about the case, Dupin purposely does not light the lamp, saying that "if it is any point requiring reflection. . . . we shall examine it to better purpose in the dark." This idea, of the mysterious, silent detective sitting and smoking in the dark while listening to his clients' cases, is one of the hallmarks of future "private-eye" stories.