Dupin tells the narrator of "Rue-Morgue" that he expects to be met by someone who is in part responsible for the crime. He says the man is probably largely innocent but he hopes the man will prove to be the key to the riddle. He gives the narrator a pistol to use should the meeting demand it. Next Dupin goes ahead and explains his reasoning.
Poe uses a theatrical technique in planting a gun in the scene,introducing the potential for explosion and death that builds theShare with your friends: