In her first YA novel, O'Brien creates a dystopian future in which to explore complex issues of morality and survival. In a world rocked by climate change, the Enclave is a much-needed bastion of civilization, and many of those who live outside its walls serve it in one fashion or another. As a midwife apprenticed to her mother, 16-year-old Gaia Stone is expected, like any other midwife, to bring the first three babies she delivers each month to the Enclave to satisfy its demands for new citizens. When her parents are taken for questioning by the Enclave, Gaia takes over for her mother, even though she's not entirely comfortable following orders unquestioningly anymore. Her quest to track down and save her parents leads her into the Enclave itself, where she befriends the handsome Captain Grey, a man with his own secrets, and discovers the unsettling truths behind the Enclave's need for children. Though predictable in places and unconvincing in others, this science fiction adventure is a brisk and sometimes provocative read, thanks to solid pacing, a resourceful heroine, and a few surprise twists. Ages 12–up. (Apr.)

Gr 7–10—In a dystopian world of the future, apprentice midwife Gaia, who has served the Enclave faithfully along with her parents, is thrust suddenly into a crisis. She delivers her first baby independently of her midwife mother and takes it to the Enclave inside the Wall as the first of her monthly quota of three newborns. Then her parents are arrested and she learns that they will soon be executed. Gaia springs into action and smuggles herself into the Enclave to rescue them. What follows is an exciting, almost breakneck adventure, as Gaia tries to discover what information the Enclave wants from her and her mother and tries to save both of them from prison. Along the way there is a mildly romantic turn to the story as Gaia develops a friendship and attraction to one of the soldiers, a man with a mysterious past. This world is one in which a small society, composed of an elite inside the Wall and a subservient class outside, is completely cut off from knowledge of anyone or anything outside of its borders. The rulers are authoritarian and mysterious and resemble a monarchy rather than the strictly ideological communitarian system in Lois Lowry's The Giver (Houghton, 1993). The cliff-hanger ending sets up the action for a sequel. Readers who enjoy adventures with a strong heroine standing up to authority against the odds will enjoy this compelling tale.—Sue Giffard, Ethical Culture Fieldston School, New York City