From the back cover:
This supplement for the Maztica Campaign Setting is a new type of product: a combination adventure and accessory. In this booklet you will find information on a new character race, the Azuposi; on new character classes for rogues, including the clown (or koyemshis); on new priest classes, including the "bent priest"; and a new magic unique to Maztica, fetishism.
The adventure itself leads your party from the known areas of the True World into the northlands, through the lands of the desert dwarves, the Poscadar elves, the Dog People, and others. Your characters will deal with desert hardships they have never endured before. They will also confront spirits they've never heard of: the spirits that have caused the downfall of Michaca, the City of Gold.
And do not forget the words of a poet of another place, and another time: "Nor all that tempts your wand'ring eyes / And heedless hearts, is lawful prize; / Nor all, that glisters, gold."