Within Arkomo's Four Kingdoms, one hundred princes are raised in total seclusion, preparing for the Departure-a sacred ceremony that will finally allow them to live freely among their people. But Sorel, Arkomo's only princess, fears the Departure isn't what it seems. Sorel uses her gift of hiding to remain unseen and unnoticed-forced into isolation because Arkomo's ancient Prophecy warns that a Daughter of Arkomo will one day destroy the Kingdoms. Sorel is convinced the Prophecy also predicts a deadly truth about the Departure, but if she reveals her identity to warn the princes, she'll undoubtedly be condemned to death. One night Sorel opens a magical Doorway into a strange world-the place she calls Hospital. There she meets 11-year-old Grace Woodward who is desperately ill. Hopeless and about to give up, everything changes for Grace when she meets Sorel and learns about Arkomo-a world that once only existed in her imagination. Grace and Sorel embark on a journey to save the Princes before the winter solstice-the night of the Departure. With Grace growing sicker each day, and Sorel dangerously close to being discovered, they'll both need a miracle to survive.