From the publisher's website:
The inside of the detached cover has the map of the subterranean village of Blackeswell. It's a site-based module. No quests or plots. The word "Fungus" is in the title for good reason. This is a creepy, mushroomy, fungusy adventure. If you are like me, you love that squishy, slimy, over-ripe botanic feel of lots of vile, rotting fungus in your D&D. This module has you covered. This is the best, most original fungus module of all time. It gave me some shudders. This is definitely the scariest of the three Psychedelic Fantasies modules.