The first Nereid Maiden, Marie, did not leave Atlantis for four centuries for any reason, let alone a vacation. But since her brother, Bastien, has found a mate in the land above, it's time for her to head up there and meet her new sister Kat and the group of panthers they belong to. She's had lovers throughout her centuries of life, but none of them was able to teach her what to expect from a man like Ethan, the alpha leader of this particular group of panthers. She finds him irresistible, a situation Ethan happily uses to his advantage. Ethan vows to protect the Atlantean beauty, a task that becomes increasingly difficult as a mysterious threat to his lands and the creatures in the area grows day by day.