In the future, in a world baked dry by the harsh sun, there are those who live inside the walled Enclave and those, like sixteen-year-old Gaia Stone, who live outside. Following in her mother's footsteps, Gaia has become a midwife, delivering babies in the world outside the wall and handing a quota over to be advanced into the privileged society of the Enclave.

Gaia has always believed this is her duty, until the night her mother and father are arrested by the very people they so loyally serve. Now Gaia is forced to question everything she has been taught, but her choice is simple: enter the world of the Enclave to rescue her parents, or die trying.