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Who can remember the name of this book about a mermaid?

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Can anybody remember that book, it's got beautiful drawings and it's about this boy and girl or somebody who finds a mermaid in a rock pool on a beach and they have to help her get back out to sea. There is also something in it about a little boy who lives in a sandcastle and finds bits of coloured glass on the beach to decorate his sandcastle with... oh and I think the little girl is sick? or something... Hmm I really need the title hahaha! think think think!