People in the trees. Hanya Yanagihara. 2015.

In 1950, a young doctor called Norton Perina signs up to accompany an anthropological expedition to a remote Micronesian island in search of a rumoured lost tribe. The expedition is a success, locating not only the tribe but also a group of forest dwellers that the scientists dub ‘The Dreamers’, a loose band of fantastically long-lived but progressively more senile islanders. Perina suspects the source of their longevity is a hard-to-find turtle, he kills one and smuggled some of its meat back to the States. He proves his thesis, earning worldwide fame and a Nobel Prize, but he soon discovers that the turtle’s miraculous property comes at a terrible price. As things quickly spiral out of control, his own demons begin to take hold, with devastating personal consequences.