The mermaid’s scales were bronze, and they shimmered like hundreds of pennies arranged close together. Her immense blue-green eyes gave a look of fragility to her face, yet he found her eyes unsettling. She was leaning against a 30-foot-long shark, which emerged from behind her and opened its mouth to reveal a great big cavern lined with hundreds of teeth - a black tunnel ready to swallow him.

Coralline is a mermaid who is engaged to the merman of her dreams. But when an oil spill wreaks havoc on her idyllic village life, her little brother falls gravely ill. Desperate to save him, she embarks on a quest to find a legendary elixir made of starlight.

Izar, a human man, is on the cusp of an invention that will enable him to mine the depths of the ocean. His discovery will soon make him the richest man on earth - while threatening merpeople with extinction. But then, suddenly, Izar finds himself transformed into a merman and caught in a web of betrayal and intrigue. Meeting Coralline in the ocean, he decides to join her on her quest for the elixir, hoping it will turn him human again.

The quest pushes Coralline and Izar together, even though their worlds are at odds. As their pasts threaten to tear them apart, a growing attraction adds to the danger. Ultimately, each of them faces an impossible choice. Should Coralline leave her fiancé for a man who might betray her? And will Izar’s dark secret cause him to lose Coralline forever?