From the introduction:
Deep in the Anauroch Desert a mysterious town suddenly appears, and the factions of Faerun want to know what mysteries it contains.
Venture into Jupitus, the lost city of the Anauroch, and learn what circumstances warrant its sudden appearance.
A four-hour adventure for 1st-4th level characters.
This scenario is distributed as a PDF file and two associated PNG files - a map and a graphic cover.