Under the border leading into Mexico, within a labyrinth of caves, a deadly presence haunts all who enter. For four friends on an expedition, the caverns become an underground graveyard as the tortured ghosts prey upon them, one by one.

两对年轻夫妇向新几内亚蛮荒之地前进,他们试图找寻迈克尔.克菲勒,他是洛克菲勒财产继承人而在1961年失踪。在路上，他们遇上了食人族。