Fia, a young woman of the Silver Moon clan, is used as a scapegoat by her family to marry Sean, the ruthless Alpha of the Shadow clan, in place of her runaway sister. Enduring endless misunderstandings and humiliation, Fia triggers her true Eclipse lineage when pushed into a corner. Upon learning the devastating truth, a regretful Sean seals a soul-mark to protect his true love. Conquering her evil sister and the clan's ancient curse, Fia rises alongside Sean to become the true King and Queen of the Shadow Clan.