Radiance (Wraith Kings, #1)

Ildiko has always known her only worth to the royal family lay in a strategic marriage. Resigned to her fate, she is horrified to learn that her intended groom isn't just a foreign aristocrat but the younger prince of a people neither familiar nor human. Bound to her new husband, Ildiko will leave behind all she's known to embrace a man shrouded in darkness but with a soul forged by light. Two people brought together by the trappings of duty and politics will discover they are destined for each other, even as the powers of a hostile kingdom scheme to tear them apart.