Rue des Fossoyeurs is the street of d'Artagnan the younger's residence and the setting for a revealing overlap of domestic life, police surveillance, and clandestine observation. The lodgings above Monsieur Bonacieux's apartment give d'Artagnan both a way past the authorities' dragnet and a hidden position from which to discover what they are trying to learn.

Lodgings and the Mousetrap

The police operation at Monsieur Bonacieux's apartment follows a deliberate method: once a suspected person is arrested, the arrest is kept secret, guards wait in the first room, and visitors who enter are detained in turn. By accumulating the establishment's regular visitors over several days, the cardinal's men make the apartment a mousetrap. Anyone who appears there is taken and interrogated.

The building's separate access matters. A passage leads to the first floor, where d'Artagnan lodges, and callers who use it are exempt from detention in the apartment below. The same address therefore contains two different spaces of power: the downstairs room is controlled by the inquisitors, while the upper lodgings remain outside their immediate net.

An Observer Above the Interrogations

Rather than leave his room, d'Artagnan makes it an observation post. He watches the visitors caught below from his windows, then removes a floorboard so that only a thin ceiling separates him from the interrogation room. Through that opening he listens to the questions put to the prisoners.

The interrogators repeatedly ask whether Madame Bonacieux or Monsieur Bonacieux has sent anything, or entrusted a message, to the person being questioned. From the pattern, d'Artagnan infers that the cardinal's people are trying to establish whether the Duke of Buckingham is in Paris and whether he has met, or may meet, the queen. The street's domestic architecture thus becomes part of the intelligence contest: the authorities use the apartment to gather information, while d'Artagnan uses the room above to overhear their method and purpose.

Return to the Residence

Later, Athos insists on accompanying d'Artagnan back to Rue des Fossoyeurs, abandoning his plan of seclusion because d'Artagnan may be in danger. They arrive without accident. Monsieur Bonacieux is standing at the door and looks at his lodger hatefully, but announces that a young woman is waiting upstairs. Recognizing her as Kitty, d'Artagnan hurries into the passage.

Kitty's visit makes the residence a place of personal arrangements as well as surveillance. When she asks for help finding a position with a lady in the provinces, d'Artagnan considers Aramis as an intermediary and rejects Porthos as a poor choice: Porthos's supposed duchess, he jokes, is dressed by her husband's clerks, and Kitty would not want to live in the Rue aux Ours. The exchange gives the lodgings a second function, as a meeting point where d'Artagnan's companions and Kitty's practical needs intersect.

Narrative Significance

Rue des Fossoyeurs is defined less by a description of its streetscape than by the way its rooms and entrances shape what characters can know and do. The separate passage shields d'Artagnan's visitors from the round-up; the removable floorboard lets him listen in on the machinery of interrogation; and the doorway brings him face to face with Monsieur Bonacieux's hostility and Kitty's appeal. The residence consequently links political surveillance with the private, improvised business of the plot.