Asterisk denotes entries on real places.
*Paris.
A great deal of Lecoq’s expertise is his knowledge of Paris. There, Gaboriau draws on his own knowledge of the city, learned as a journalist. This knowledge extends beyond the official maps of the city; Lecoq trails his murder suspects out of a garden and into the unmarked wasteland beyond; he can track suspects even down unnamed streets.
Locales outside Paris are important primarily as they influence Paris, symbolizing European anxiety over a shifting sense of place in the nineteenth century. Some places produce known characters, such as a coachman who volunteers his help in the investigation in part because he is a Breton. However, unnamed places are threats. When the murder suspect May tells of being found as an infant by the side of the road, Lecoq is at a loss as to know his character.
Poivriere (pwah-vree-ehr). Fictional Parisian saloon in which the murder occurs. The saloon takes its name from the fact that it is a place where men get “peppered” (drunk). While Lecoq studies the saloon in sufficient detail to draw it as part of his police report, the only descriptions given are those that contribute to his investigation, such as knowing the sight lines between levels. Because the saloon represents any lower-class public meeting house, the crime itself could have been committed anywhere.
Palais de Justice. Official building housing judges. Lecoq’s investigation divides into three interwoven approaches. First, information gathering happens throughout Paris. The bulk of the novel follows Lecoq through its streets. Second, that information is sorted at the Palais de Justice, where the magistrate (or judge of instruction) responsible for rendering a verdict in the case has his offices. The Palais is described in enough detail to seem threatening, but the description is still sketchy. Gaboriau keeps the focus on the judge’s interrogation of suspects and witnesses. When Lecoq fails to obtain justice through his work at the official Palais, he visits its symbolic counterpart: the home of Papa Tarabet, a consulting amateur detective who prefigures Sherlock Holmes in his use of logic.
Prison. Parisian jail in which Lecoq takes a cell next to the suspect May’s in order to observe him in secret, thereby undertaking the third approach to his investigation: observation. Like the novel’s descriptions of the morgue, descriptions of the prison demonstrate the novel’s link to the nineteenth century sensational novel. However, the act of observing the prisoner is a necessary step in confirming his guilt. Like Lecoq’s ultimate failure to convict May, the inability of the officials to keep criminals from communicating symbolizes modern society’s inability to keep any place safe from crime and corruption. Likewise, May’s refusal to drop his guard in his cell gestures toward an erosion of the belief in a private space; May, and perhaps readers, must treat all places as public.