Iris loves being a mermaid. So, when her Mom, Queen of the Ocean, declares that she's to be wed to a human, she's furious.

Finn wants to be the first human mayor of magical New York. He needs a magical wife as part of his PR strategy to win over his constituents, and he's fine with a loveless marriage.

But after his reluctant fiancé Iris douses him with seawater at their first meeting, Finn finds himself wanting this romance to be more than a business arrangement.

Iris can't stand Finn on principle, but no matter how far she pushes him, Finn just won't break off their engagement. In fact, he keeps going out of his way to make her life easier. And soon, this mermaid is left wondering if life might be better in Manhattan than under the sea…