Tío has an important mission for Elena, Jorge, and Fiona. They're being sent to the southern lowlands of ancient Maya. They must find not one but two poltergeists who are forcing the Maya people to endlessly play their once-fun ball game, ulama! Will the kids be able to put the poltergeists to rest? Join the Secret Society of Monster Hunters as they explore the ancient Maya culture and race against the clock to put these poltergeists to rest. This graphic novel includes monster profiles and survival tips as well as in-depth content on the social structure, government, and fashion of the Maya civilization. Backmatter includes an activity page and character information.