The ruins : a novel
(Book)

"Two American couples, just out of college, enjoy a pleasant, lazy beach holiday together in Mexico. On an impulse, they go off with newfound friends in search of one of their group--the young German, who, in pursuit of a girl, has headed for the remote Mayan ruins, site of a fabled archeological dig. Then the searchers--moving into the wild interior--begin to suspect that there is an insidious, horrific 'other' among them..."--From publisher description.