The Murders in the Rue Morgue Jean-Jacques Rousseau: "to deny that which is, and explore that which is not"). In a letter to friend Dr. Joseph Snodgrass, Poe said of "The Murders in the Rue Morgue", "its "theme" was the exercise of ingenuity in detecting a murderer." Dupin is not a professional detective; he decides to investigate the murders in the Rue Morgue for his personal amusement. He also has a desire for truth and to prove a falsely accused man innocent. His interests are not financial and he even declines a monetary reward from the owner of the orangutan. The revelation of the actual murderer
The Murders in the Rue Morgue and a leap to a set of open window shutters. Showing an unusual tuft of hair he recovered from the scene, and demonstrating the impossibility of the daughter being strangled by a human hand, Dupin concludes that an "Ourang-Outang" (orangutan) killed the women. He has placed an advertisement in the local newspaper asking if anyone has lost such an animal, and a sailor soon arrives looking for it. The sailor offers to pay a reward, but Dupin is interested only in learning the circumstances behind the two murders. The sailor explains that he captured the orangutan while in Borneo and