An anthropologist spends many years (multiple trips) amongst the Yanomamo Indians of the Amazon, who had had very little contact with civilization, and only a limited amount of its goods (e.g. some matches, a few better axes). He eventually marries one of the tribe, who returns to the United States with him. Anthropologist's faculty advisor is a real villain. The account is personal, rather than scholarly, although Good did write scholarly papers, and he refrains from much abstract analysis or generalization. The Indians have strong human emotional attachments for children, and family, and are not very violent, but the society is very sexist, tribes are prone to get mad at other tribes, and there isn't much concept of an abstract morality. It is a utilitarian morality, and tribe members are not likely to stick their necks out to protest unfair treatment to others. Disapproval does carry weight.