From publisher blurb: Mexico, 1938: The discovery of a mythical tecuanes, a were-jaguar, on the grounds of a henequen plantation in the Yucatan leads a group of adventerers and scientists into the hazardous cave complexes under the jungle in search of its origins. This adventure is for use with the Ubiquity system that powers Hollow Earth Expedition and other role playing games. The scenario is designed for two to five players, and can be played in about four hours.