In 1976, David is fishing off the island of Black Conch when he comes upon a mermaid by the name of Aycayia. Once a beautiful young woman, she was cursed by jealous wives to live in this form for the rest of her days. But after the mermaid is caught by American tourists, David rescues and hides her away in his home, finding that, once out of the water, she begins to transform back into a woman. Now David must work to win Aycayia's trust while she relearns what it is to be human, navigating not only her new body but also her relationship with others on the island. As David and Aycayia grow to love each other, they juggle both the joys and the dangers of life on shore. But will the former mermaid be able to escape her curse?

When a flood destroys Gavin Weald’s home, tearing apart his family and his way of life, he doesn’t know how to continue. A year later, he returns to his rebuilt home and tries to start again, but when the new rainy season arrives, so do his daughter’s nightmares about the torrents, and life there becomes unbearable.