Treehouse Books & Melanie Voland 
The Story of Undine: Traditional Mermaid Folk Stories Collection [EPUB ebook] 

A changeling water spirit gains a soul, when she falls in love with a human being… But if a human rejects the love of one of her kind, she will disappear… And if he betrays her, he will die… A romantic, tragic, supernatural story, based on a very famous european legend. This story may only be suitable for higher middle grade age kids, young adults and anyone else. This is book 12 in our Traditional Mermaid Folk Stories Collection.