If it were possible, Shelley would live at sea. It’s better to be a fish than to live like her: her parents are divorced, she doesn’t know anyone at the new school, and she also failed her last swimming competition.

True, now she has friends! And it’s okay that the girls consider Shelley a nerd and even (what a horror!) they forced her to throw a plastic coffee cup into the ocean.

That’s where it all started. First, Shelly was washed away by a wave, and then miracles began to happen: in a dream, she ended up in a cave with a sea witch. She promised to fulfill the girl’s wish...

But everything didn’t go as she thought. Not at all like that. Horribly wrong. What's wrong with her hands? And why is it so hard to breathe? What kind of deal did she make with Ursula?