We had "strayed", as the Swede put it, into some region or some set of conditions where the risks were great, yet unintelligible to us; where the frontiers of some unknown world lay close about us.

Brilliant little cosmic horror piece, set not in an occult New England university or an ageless mysterious city but just at a campsite in a spot that seems... thin. Where the old-growth trees don't grow the way they should. Where two people realise that they have to leave, but can't. Where they can't even put words to it for fear of giving it power. Damnit, I have to read more Blackwood.