The Murders in the Rue Morgue
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 removes the crime, as neither the orangutan nor its owner can be held responsible. Poe scholar Arthur Hobson Quinn speculates that later detective stories might have set up M. Le Bon, the suspect who is arrested, as appearing guilty as a red herring, though Poe chose not to.