Sixteen-year-old Santee lives on the bad side of the city, where even a government-enforced Curfew can't stop the ever-worsening Threats.
Z, the cute new boy at school, is from the good side. And he seems to like her - despite her reputation. Finally, Santee's life is looking up.
Until everything changes.
A wall goes up overnight, dividing the city. A that that imprisons Santee's family. A wall that traps her on the outside...