River of Death
Alistair MacLean
 Hamilton, allegedly an expert on the jungle, shows up in Brazil having apparently found a lost Indian civilization in the wilderness of the Amazon jungle. This attracts the attention of Smith, a wealthy German who appeared out of nowhere in the late 1940s with a fortune and group of ruthless cronies. Smith hires Hamilton to take him to see the lost city. Hamilton with his two trusty companions, together with Smith and his entourage set off, facing giant anacondas, giant spiders, cannibalistic natives, and so on, discovering a settlement of Nazi war criminals and their descendents, living as if the Third Reich had never ended.