Possible Clues:

• Literary signature
• "The Raven" writer, in footnotes
• 'The Facts in the Case of ___' (Andrew Sinclair novel that pays homage to a mystery writer)
• Author of Gothic short stories, in short
• "Israfel" writer's signature, perhaps
• ''The Gold Bug'' writer's signature, perhaps
• 'Berenice' author, briefly
• ''The Oblong Box'' author, in footnotes
• 'The Raven' author, briefly
• Macabre signature