Why does Poe take on the identity of Auguste Dupin in the novel, The Man Who Was Poe?

Poe wants to remain incognito when he arrives in Providence, Rhode Island, partly because of the famous author's general sense of melodramatic paranoia. This oftentimes unflattering portrait depicts a maudlin, morbid, moody artist. Yet when Poe pretends to be Dupin, he takes on the characteristics of his great fictional detective with relish. Poe as Dupin enjoys outwitting criminals and tracking down clues. His energetic investigation inspires young Edmund to trust him, and Edmund feels grateful to Dupin for feeding and protecting him as well. Unfortunately, Edmund doesn't realize Poe is playing a role. Once Poe tires of pretending to be Dupin, Poe loses interest in helping Edmund.