Evermore
Steward, Barbara, and Dwight Steward. Evermore. 1st ed. New York: Morrow, 1978.
This is a detective story written where Poe himself is the detective. After faking his own death to escape political assasination, he returns to investigate the Mayerling affaire. It is written in first-person. It takes place in Paris. The style is more detective story Poe than macabre Poe. There's really no self depracation and misery. It's a straight up detective story.