Nearly forty years ago, Lux Madigan's twin sister, Nix, vanished from the asylum where they were institutionalized during the Eugenics Movement. Lux is haunted by her disappearance but more by what happened in the moments before. Or at least what she recalls happening. Approaching sixty with a damaged memory and a fatal heart condition, Lux's time is running out. In desperate belief that her sister is still alive, she spends her days searching Cape Perpetua, a city of twins that according to legend was cursed when the Twin Sisters ran ashore in the mid-twentieth century. But the hole in Lux's...