One of the members of The Five Fishes, a priest, and secretly the father of Julian’s unborn child. Pious and even-tempered, Luke yearns for a version of the world that still values compassion, justice, and love. While on the run, he and Julian pray together daily, performing holy sacraments at a makeshift altar. Theo suspects that Rolf allowed Luke into the group despite his lack of “practical skills” due to superstition, and the underlying belief that Luke could function as a “bringer of luck” and a “possessor of mystic powers and ancient charms.” Luke is killed during an encounter with a group of feral Omegas, sacrificing himself to save Julian (and her baby). Julian, mourning his death, reveals to the group that Luke was the true father of her child. Luke’s status as the father of the child—the first born on Earth in 25 years—implies a religious, or at least moral, foundation to the miracle of the baby’s existence, though the book doesn’t push much past that faint suggestion.