The Human Bride. The Blood Moon Treaty, #1

Every hundred years, peace among the seven supernatural clans is renewed through blood, vows, and arranged marriage. Vampires, moonborn, witches, spirits, dragon-blooded, sea-folk, and graveborn have survived for centuries under the ancient Blood Moon Treaty. But when the latest treaty bride is murdered inside the vampire court, the fragile peace begins to crack-and humanity may pay the price. Amara Vale is only a human historian.
Hired to translate the original treaty, she expects old languages, forgotten clauses, and political secrets. Instead, the treaty names her as the next central bride: the one person meant to bind all seven clans together. She should have no magic. But every clan's power reacts to her blood. Taken to the dangerous and glittering vampire court, Amara must survive royal schemes, supernatural desire, and a murder investigation that could ignite a war.
Prince Lucien Draven wants peace, but his court hides deadly secrets. Kael Thorn, a fierce moonborn warrior, trusts no treaty and no vampire. And somewhere beneath the ancient vows, the Blood Moon itself is beginning to wake. Darkly romantic, political, and atmospheric, The Human Bride is a supernatural fantasy of forbidden alliances, dangerous court intrigue, blood magic, and one woman's fight to remain unowned in a world determined to claim her.