From publisher blurb:
Advanced Adventures #35: The Desert Shrine of the Sightless Sisters is an OSRIC module designed for 6-10 adventurers of levels 5-8.
Several days to the east of the desert trading city Isfala, far from any oasis or caravan route, lies the remnants of an ancient Ziggurat, so crumbled with years as to be little more than an oddly-shaped mound in the surrounding wastes. The nomads say that it is an ancient temple to forgotten gods, a place of ill omen. Some whisper that it is not quite deserted, and that a sisterhood of devotees remains, guarding ancient secrets.
Although local superstition considers it a forbidden place, for a few coins some less-devout nomads might be willing to give directions or even act as guide, although even the greediest dares not approach the place too closely.