For Gloom The Bell Tolls
For Gloom The Bell Tolls is a whimsical D&D one-shot mystery adventure about an island of fish-people plagues by a mysterious illness, written by Jon Baker and myself. It was written many years ago, and as a result is quite simple and linear, but I've run it at least eight times and each time has been a blast.
You may read the adventure here.
Here's a preview (spoilers ahead!):
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