From the introduction:
Thirty two years ago, Zelligar the Unknown and Rogahn the Fearless led a mercenary army into the Maerthwatch Mountains to crush their hated enemies - the barbaric Orgahn Tribes - never to be heard from again. It is said that a great treasure is hidden somewhere in the depths of their abandoned underground fortress. Do you have what it takes to find it?
A 15-20 hour adventure for 5-7 characters of 1st to 3rd level
The item typically is distributed as a ZIP archive including the PDF game document and four PNG files for maps - two keyed maps for the DM and two unkeyed maps for the players. The maps show an upper and lower level of "Quasqueton".