Toad Stone

There is a village surrounded by bog and fen which is shrouded in fog from October to January.  For months at a time it is completely cut off from the rest of the world.  One day a Traveller arrives, hooded and wearing a ring with a strange mud coloured stone lodged in it.  After a night staying at the local inn the fog arrives early.Is the Traveller trapped in here with the Villagers?  Are the Vi…