Rani is the princess of Abai, whose merciless father, the raja, keeps her caged in the palace. She craves nothing more than freedom—and to fulfill her recently-deceased tutor's last wish, to find a magical stone that could change the coming war. The opportunity to leave the palace presents itself when she finds a girl who looks exactly like her: Ria. But this sister-switch might reveal more than she ever thought . . .