Kaylee Everett’s life is upended when a series of increasingly bizarre anomalies culminates in the world suddenly appearing long abandoned. She and her sister end up trapped in what may be the last surviving city, where people’s strange and fearful behavior hints at sinister forces lurking in the shadows. As the sun sets and the streets clear out, the sisters meet a small group of desperate survivors who reveal the secret most refuse to talk about: Any person caught outdoors at night mysteriously disappears.