A wealthy heiress named Ariel is pushed overboard by her own father, fiancé, and best friend—after they con her out of everything her mother left her: land, shares, insurance money. She survives by waking a mermaid king in the deep sea—Norval, who's been trapped in the abyss for a hundred years.
They make a deal. He gets her back to the surface. She helps him take back what was stolen from him. Piece by piece, she uncovers the truth: her family has been siphoning abyssal energy for generations to stay rich and powerful.
At her engagement party, she puts every piece of evidence on display in front of everyone. Her father goes to prison. But the abyss seal is breaking apart. They go down together and seal it with blood. Norval loses his power and becomes fully human. He marries Eileen under the lighthouse.
After that, there's no more hate between land and sea. Just the lighthouse beam sweeping across the reef and the water—and two people sitting there, quiet, listening to the tide together.
