I never got a change to play this micro back in the day and in doing some research I came upon a great review of this game. What strikes me as most interesting is it appears to be the exact type of game I would have loved, sandbox with a purpose!
The gist of the adventure is there are 24 amulet scattered about randomly in the Valley of Death. In order to escape you have to find the right amulets. Of course while searching there are lots of random encounters.
So while there are no specific "story lines" to read as is the case with most solos, there is a great deal of adventure to be had. As a result, the story will be what ever trials and tribulations you suffer as you seek to exit the valley.
There is a nice review to read on this adventure and what was most notable to me is the adventure was apparently written with only Melee/Wizard rules and prior to the publishing of AM/AW/ITL...yet this adventure was not published until AFTER the full TFT line was released which causes some issues.
So I will point you first to a nifty little review of this classic.
And second to Scribd which has a PDF copy you can look at.
Did you ever get a chance to play it? If so what was your experience with it?
Also on Angantyr's blog is an outstanding treasure trove I found...a list of EVERY potential and unpublished TFT product! Good lord what might have been! I wonder if Howard Thompson had focused his (or someone's) energy on making these real what might have been...well read it and see for yourself!