From the author of the Waterstones Children's Prize shortlisted Once Upon a Unicorn Horn comes a beautiful story of friendship and protecting the oceans.

Theodore has a little boat and a big passion: collecting fish. He loves nothing better than discovering a new fish for his collection. But one day, he finds something he's never seen before: a tiny creature in a beautiful shell. Ignoring the voice that tells him to leave her alone, he takes her home, but in a tank she gets weaker and weaker. Can Theodore learn that the creature belongs in the ocean, before it's too late?

This heart-warming story about how mermaids got their tails is the follow-up to the critically acclaimed and best-selling Once Upon A Unicorn Horn and Once Upon a Dragon's Fire.

Beatrice Blue is a visual development artist and freelance illustrator currently living in Montréal, Quebec. She works in the animation industry as well as picture books and illustration. She lives with her husband Dani and her dog Jungle, always surrounded by great adventures - and a lot of snow. Once Upon a Unicorn Horn is her first children's book.