The Anthropophagi of Xambaala

From publisher blurb:

An adventure in Hyperborea designed for from four to six characters of 1st through 3rd level

Furtive and odious tales circle through various Hyperborean ports of call. Rumours whisper of an ancient occult city, Xambaala, clinging to the edge of the Zakath Desert. Perhaps the hideous horrors said to assail the city in the darkest hours are exaggerated. Maybe too another explanation can be found for the foreigners who are said to have disappeared to some uncanny fate. But the whispering tongues also hint that gold glints in the shadows of Xambaala, ready to be taken by the bold.