The New York private investigators are hired to locate a pair of missioners who are lost in jungles of panama. Their only clue is a mysterious letter with the name "Gila". But what is Gila? Is it a person? a place? a river? Only local natives know for sure, but they’re not talking. Some say that "Gila" is a place of pure evil. Others say that it is the resting place of the devil himself! The investigators follow a path of clues that leads them into a jungle filled with ancient Aztec ruins, voodoo, and an army of walking dead.