The Archeo's grandfather, Dr. James Michaels received an urgent telegram from Dr. Jando Buriti the archeologist that had guided them into the forbidding interior of the Pantanal in search the City of Z. The telegram said Dr. Guidion Duate, Jando's closest archeological colleague had disappeared along with his 6 man archeological team. They were somewhere deep in the Sierra Madre mountains in Mexico. Jando wanted his good friend Jim Michaels and his grandsons the Archeo's to drop everything and come and help him find them.It was the end of the fall quarter of their junior year at the university for Sam, Yoder and Mike. As soon as their last exam was finished and their grandfather wrapped up his work they were on the plane headed to Brazil where they met Jando and his team. The story Jando told them while they were preparing to go in search of Guidion Duate fired their imaginations in ways they never thought possible. Dr. Duate had been looking for the valley of Chicomoztoc which was said to hold secret passages to the underground worlds of the Aztechas. The 5 tribes of the Aztecahs were the tribes of origin of the Aztec people. They were said to live in worlds of unbelievable beauty and abundance.If those worlds could be found it would be the greatest archeological discovery of all time. Guidion Duate had been in search of them when he disappeared. From the moment they left Chapala, in search of the lost archeological expedition the Archeo's and the rest of the rescue team entered an adventure beyond their wildest expectations.