Horror Novella & Standalone Adventure Module
A few years ago, I'd written and published a horror novella called Dark Harbor.
As a book, I thought it was at best fairly decent, but it really worked as the starting point for a mythology and campaign setting.
Rather than write one of the 5+ sequels I had envisioned, I will create a new campaign setting/adventure scenario which takes place in the context of the fiction book.
This will be a dark, gothic horror, Ravenloft-esque, Castlevania-like sort of adventure, likely measuring in the 200-page realm.