An assassin in an emperor’s service, a curse carried in the blood: Kai Butler is working with the oldest materials in fantasy and doing so without apology. Emperor’s Assassin is the series, and titles built from familiar parts earn their keep through execution rather than novelty.
What distinguishes the writing, on the catalogue’s evidence, is where the romance sits. This is queer fantasy in which the relationship carries genuine narrative weight rather than decorating the margins of a quest. The LGBTQ+ and romance shelves both lay claim to it, and neither claim reads as a courtesy.
Little else is on record, which places Butler among the many capable genre writers building an audience one release at a time.