Adam Leith Gollner weaves together religion, science, and mythology in a gripping exploration of the most universal of human obsessions: immortality. In a narrative that pivots between profundity and hilarity, he brings us into the world of those whose lives are shaped by a belief in immortality. From a Jesuit priest on his deathbed to anti-aging researchers at Harvard, Gollner--sorting truth from absurdity--canvasses religion and science for insight, along with an array of cults, myths, and fringe figures. Combining immersive reporting, rigorous research, and lyrical prose, Gollner charts the rise of longevity science from its alchemical beginnings to modern-day genetic interventions. He delves into the symbolic representation of eternal life and its connection to water. Interlaced throughout is a compelling meditation on the nature of belief, showing how every story we tell about immortality is a story about the meaning of death.