In the HPL story Whisperer in the Darkness a black stone (presumably a Tablet of some sort) is sought after by the Mi-Go. As one of my favourite stories, I was wondering, did anything happen after the events of the story? Does the Tablet resurface?
I'm asking primarily so I can run a roleplaying game of Call of Cthulhu for some friends of mine, and I'm wishing to extend the story of the tablet, but I don't want to step on the toes of continuity, if at all possible.
I found mention of G'harne Fragments from a book by Brian Lumley but I can't find a reference to which story, or whether the two black stones are one and the same.
Does this give any clues, that might help?