"The People in the Trees" is a novel by Hanya Yanagihara that follows the story of Dr. Abraham Norton Perina, a scientist who discovers a tribe in Micronesia that possesses the secret to immortality through a rare tree. His findings lead to fame and fortune, but also to ethical dilemmas and personal conflicts. As Dr. Perina navigates his new life, he grapples with the consequences of his discoveries, including the impact on the tribe and his own moral compass. The narrative explores themes of exploitation, the nature of humanity, and the complexities of scientific advancement.