The High Priestess — Katee Robert

Marianna Zain is in trouble. The handsome stranger she just kissed? He's a member of the most terrifying hate-group in the universe. Even after he takes her captive, Marianna can't shake her initial instincts that he's a man of worthand her only chance at escaping death. One of Sanctify's most decorated lieutenants, Gerard Leoni thought he had everything figured out. But then he crosses paths with a Diviner, the most despised of the alien races, and is honor-bound to bring her in. One night with Marianna makes him question everything he knows. As the day of her scheduled execution draws near, Marianna forms a plan. She's going to seduce Gerarda task that would be simpler if she weren't being seduced as well. But Sanctify doesn't take kindly to their people cavorting with aliens, and instead of finding a savior, Marianna may be dragging Gerard to his death alongside her