For all of written history, on the day of Da Un Marcu, fifty boys and girls across the three kingdoms are marked. They become a class apart from society. Taken to join their brothers and sisters, the Chisanta, they enter a culture of knowledge-keepers, martial artists, and possessors of strange and wonderful abilities.
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?