[sblock=spoilers]One of the ways it can be used is: People and cattle go missing, with hunched shapes dragging them off to a cave in the night. Dare you explore?
The other way: PCs travelling along an underground river discover some interesting looking ruins.
Either way, there's a shroom (a humanoid mushroom) creating pod people and using humans as fertilizer. And it has control over some plant creatures, like hanging snagworts, insane animated trees, a captured treant, etc.
Good fun. Lots of encounters that have encouraged role-playing and problem-solving in addition to simply rolling the dice. A lvl 1 module by Matthew Finch.
I have been converting it to RCFG on the fly, and it is a lot of fun.[/sblock]