Wraith Kings

A fantasy romance series by Grace Draven set in a world where the human kingdom of Gaur and the non-human Kai coexist in uneasy alliance. It opens with Brishen Khaskem, a Kai prince, and Ildiko, the human noblewoman he marries to seal a political treaty, and follows their kingdom through a rising supernatural threat across three books to date, with a fourth, The Nomas King, announced but not yet published.