Two separate expeditions into the heart of the Amazon rainforest have trespassed upon Yanomami territory. On one side, Reinhard and his Nazis are looking for a sunken submarine and the gold it transported. On the other, Kathy Austin and Captain Delio of the Brazilian Navy are tracking a potentially extraterrestrial being. Threatened by both the hostile natives and the dangerous jungle itself, all will soon come to realise that the two quests may, in fact, be one and the same ...