A cunning criminal in "The Purloined Letter" who is both a poet and a mathematician and appears. This dual sensibility allows him to completely baffle the and the police. He meets his match in , whom he once wronged and solves the case as a kind of revenge. The Minister D____ and Dupin are actually very similar, and suggest a split personality, doppelganger theme, if a bit more subtly than some of Poe’s other tales.