The Murders in the Rue Morgue Poe's Dupin displays many traits which became literary conventions in subsequent fictional detectives, including Sherlock Holmes and Hercule Poirot. Many later characters, for example, follow Poe's model of the brilliant detective, his personal friend who serves as narrator, and the final revelation being presented before the reasoning that leads up to it. Dupin himself reappears in "The Mystery of Marie Rogêt" and "The Purloined Letter". The unnamed narrator of the story opens with a lengthy commentary on the nature and practice of analytical reasoning, then describes the circumstances under which he first met Dupin during an extended visit to Paris.
The Murders in the Rue Morgue one male and French, but disagreed on the language spoken by the other. The speech was unclear, and all witnesses claimed not to know the language they believed the second voice to be speaking. When a bank clerk named Adolphe Le Bon is arrested even though no evidence exists pointing to his guilt (other than his delivering the gold coins to the two ladies the day before), Dupin becomes intrigued and remembers a service that Le Bon once performed for him. He decides to offer his assistance to "G–", the prefect of police. Because none of the witnesses can agree