On the surface, The Grimpen Affair is a FREE 1970s British folk horror tabletop role playing game built from the Department 23 core rulebook. It is a single adventure that should take 4-5 people an afternoon to complete.
But that’s not the whole story...
https://bookhouse.uk/shop/publications/treasure-hunts/the-grimpen-affair/
For fans of: #puzzlebook #escaperoom #boardgames #TTRPG #treasurehunts