When Yarrow discovers himself marked, he feels lost and lonely; until he meets Bray, a spirited and curious girl with whom he feels uncommonly connected. As the two of them become familiar with their new lives, unaccountable events unsettle the peace. A mysterious murder leaves the Chisanta in confusion. Odder still, one of the fifty children never arrives. In the years that follow, more and more children of the Chisanta go missing.
Ten years later, the devastating truth comes to light. The death of a young marked girl is uncovered. Yarrow and Bray—separated for a decade and grown apart—are thrust back together to investigate the crime. Can they overcome their differences to save the fate of their kind and the peace of the nation?