Dupin is from what was once a wealthy family, but "by a variety of untoward events" has been reduced to more humble circumstances, and contents himself only with the basic necessities of life.
He now lives in Paris with his close friend, the anonymous narrator of the stories.
The two met by accident while both were searching for "the same rare and very remarkable volume" in an obscure library.
This scene, the two characters searching for a hidden text, serves as a metaphor for detection.
They promptly move to an old manor located in Faubourg Saint-Germain.
For hobbies, Dupin is "fond" of enigmas, conundrums, and hieroglyphics.
He bears the title Chevalier, meaning that he is a knight in the Légion d'honneur.
Dupin shares some features with the later gentleman detective, a character type that became common in the Golden Age of Detective Fiction.
He is acquainted with police prefect "G.", who appears in all three stories seeking his counsel.

In "The Murders in the Rue Morgue", Dupin investigates the murder of a mother and daughter in Paris.
He investigates another murder in "The Mystery of Marie Rogêt".
This story was based on the true story of Mary Rogers, a saleswoman at a cigar store in Manhattan whose body was found floating in the Hudson River in 1841.
Dupin's final appearance, in "The Purloined Letter", features an investigation of a letter stolen from the French queen.
Poe called this story "perhaps, the best of my tales of ratiocination".
Throughout the three stories, Dupin travels through three distinct settings.
In "The Murders in the Rue Morgue", he travels through city streets; in "The Mystery of Marie Rogêt", he is in the wide outdoors; in "The Purloined Letter", he is in an enclosed private space.

Dupin is not actually a professional detective, and his motivations change through his appearances.
In "The Murders in the Rue Morgue", he investigates the murders for his personal amusement, and to prove the innocence of a falsely accused man.
He refuses a financial reward.
However, in "The Purloined Letter", Dupin purposefully pursues a financial reward.
Dupin is from what was once a wealthy family, but "by a variety of untoward events" has been reduced to more humble circumstances, and contents himself only with the basic necessities of life. He now lives in Paris with his close friend, the anonymous narrator of the stories. The two met by accident while both were searching for "the same rare and very remarkable volume" in an obscure library. This scene, the two characters searching for a hidden text, serves as a metaphor for detection. They promptly move to an old manor located in Faubourg Saint-Germain. For hobbies, Dupin is "fond" of enigmas, conundrums, and hieroglyphics. He bears the title Chevalier, meaning that he is a knight in the Légion d'honneur. Dupin shares some features with the later gentleman detective, a character type that became common in the Golden Age of Detective Fiction. He is acquainted with police prefect "G.", who appears in all three stories seeking his counsel.
In "The Murders in the Rue Morgue", Dupin investigates the murder of a mother and daughter in Paris. He investigates another murder in "The Mystery of Marie Rogêt". This story was based on the true story of Mary Rogers, a saleswoman at a cigar store in Manhattan whose body was found floating in the Hudson River in 1841. Dupin's final appearance, in "The Purloined Letter", features an investigation of a letter stolen from the French queen. Poe called this story "perhaps, the best of my tales of ratiocination". Throughout the three stories, Dupin travels through three distinct settings. In "The Murders in the Rue Morgue", he travels through city streets; in "The Mystery of Marie Rogêt", he is in the wide outdoors; in "The Purloined Letter", he is in an enclosed private space.
Dupin is not actually a professional detective, and his motivations change through his appearances. In "The Murders in the Rue Morgue", he investigates the murders for his personal amusement, and to prove the innocence of a falsely accused man. He refuses a financial reward. However, in "The Purloined Letter", Dupin purposefully pursues a financial reward.
C. Auguste Dupin