According to legend, the native tribes of Imperia harbored a mysterious power capable of warding off death itself…

As the threat of war places her younger brother in grave danger, the restless daughter of the emperor, Iris Wu, turns her back on her royal title and joins the ranks of the Order of Alabass—the only people who she believes can help her. Here, she learns how to fight among a band of highly trained warriors and discovers what it means to truly feel alive.

However, something dark is brewing in the depths of the city. When Iris learns their leader is hunting for a legendary power, known as the Blood Marrow, Iris becomes more valuable than ever. As she embarks on dangerous missions, builds unlikely friendships, and falls into an even more unlikely romance with the leader’s arrogant, brooding son, she must decide where her loyalties truly lie.

On top of it all, for any chance at survival, Iris must discover the truth of the Marrow—if there is any truth to it at all. In a thrilling journey of power, mystery, and love, Iris discovers that her past, her pedigree, and her future are more intertwined with the Order than she had ever imagined. And it very well could destroy her.