Deep within the Maya underworld, in a place of darkness known as Xibalba, the Hero Twins Hunahpu and Xbalanque face their most dangerous ordeal yet: the House of Bats. To protect themselves against its bloodthirsty inhabitants, they hide inside their blowguns. Their ploy seems to work. But then Hunahpu peeks outside, causing a terrifying bat god to swoop down and rip off his head…