Summer was supposed to be Ginika's time for fun, friends and fairs. But instead she's been sent to live at the dead-end seaside boarding house her grandparents run. Even though her parents say it's just for a little while, she can't help feeling abandoned and heartbroken to be missing out on everything she loves back home. And then she meets Peri. He leaps and dives through the water like a dolphin and he talks like a burst of bubbles. He's not exactly a mermaid, but he's definitely something Ginika's never seen before. His family is far away too, but unlike Ginika, he loves his independence. As Ginika shows Peri her world, she starts to feel free as well. They don't need anyone else when they've got each other. But then the lights and noise of the human world start to change Peri. And when things spin out of control, Ginika must be the bravest she's ever been to face her fears.