In a changed world where the sky bleeds red, winter is hotter than hell and full of sandstorms, and summer's even hotter with raging fires that roam the desert-like country, the Heaters manage to survive, barely. Due to toxic air, life expectancies are so low that the only way the tribe can survive is by forcing women to procreate when they turn 16 and every three years thereafter. It is their duty as Bearers. Fifteen-year-old Siena is a Youngling, soon to be a Bearer, when she starts hearing rumors of another tribe of all women, called the Wild Ones. They are known to kidnap Youngling girls before the Call, the ceremony in which Bearers are given a husband with whom to bear children with. As the desert sands run out on her life's hourglass, Siena must uncover the truth about the Wild Ones while untangling the web of lies and deceit her father has masterfully spun.