When ninety-five percent of the world’s population disappears for no apparent reason, Mira does what she can to create some semblance of a life: She cobbles together a haphazard community named Zion, scavenges the Piles for supplies they might need, and avoids loving anyone she can’t afford to lose. Four years after the Rending, Mira has everything under control. Almost.
Then Mira’s best friend, Lana, announces her pregnancy, the first in this strange world and a new source of hope for Mira. But Lana gives birth to an inanimate object—and soon other women of Zion do, too—and the thin veil of normalcy Mira has thrown over her new world begins to fray. As the community wrestles with the presence of these Babies, a confident outsider named Michael appears, proselytizing about the world outside Zion. He lures Lana away and when she doesn’t return, Mira has to decide how much she’s willing to let go in order to save her friend, her community, and her own fraught pregnancy.