It sounds like you're looking for a good story or campaign concept involving the Tome of Adventure Design , and you mentioned finding a PDF on PDFCoffee (a site that hosts various user-uploaded documents).
That said, I can help you — no file needed, since I know its structure. The Tome of Adventure Design is famous for random tables that build adventures step-by-step. Here’s a sample story created using its methods: Story Seed: "The Silence Under Thornwell" Step 1 – Core Motivation (Table 1-2: Primary Goal) Roll result: Destroy a threat to a community.
First, a quick note: PDFCoffee is an unofficial file-sharing site. The Tome of Adventure Design (by Matt Finch, published by Frog God Games) is a paid product. If you like it, supporting the publisher on DriveThruRPG is the best way to get a clean, complete, legal PDF.
Roll results: A well or sinkhole behind a chapel. Atmosphere = perfect, unnerving silence. The Story In the village of Thornwell, the chapel's sacred well has gone silent. No dripping water. No echo. Dropping a stone yields no splash — just a faint, distant thud of dry earth. Worse, villagers have begun sleepwalking toward the well at midnight, their mouths sewn shut with silver thread they don't remember touching.
