"Life in the perilous Thorn district is a constant battle for Arvelle and her younger brothers. And the vampire standing on her doorstep is about to turn their world upside down. Faced with an unthinkable choice, Arvelle makes a magically binding vow to do the impossible: kill the emperor, an ancient vampire created by the god Umbros. But first, she must enter the Sundering--an arena where only the fastest, strongest, and deadliest survive long enough...