Striking out into the wasteland with nothing but her baby sister, a handful of supplies, and a rumor to guide her, sixteen-year-old midwife Gaia Stone survives, only to be captured by the people of Sylum, a dystopian society where women rule the men who drastically outnumber them, and a kiss is a crime. In order to see her sister again, Gaia must submit to their strict social code and the oppressive rules of Matrarc Olivia. Meanwhile, two brothers claim her attention as they attempt to understand the environmental trap that keeps the people of Sylum captive, and suddenly Gaia must contend with the exciting, uncomfortable, and altogether new feeling of being desired.

But when someone from her past shows up, Gaia discovers that survival alone is not enough and that justice requires sacrifice.