Treehouse Books & Melanie Voland 
The Ferryman and The Mermaids and The Magic Guitar: Traditional Mermaid Folk Stories Collection [EPUB ebook] 

A poor, young ferryman meets an old magician, who changes his luck, and his life…A magical traditional fantasy folk story adventure, with lots of interesting twists in the tale. This short story may not be suitable for younger kids, as it is a bit scary at the end, but anyone else can read it. This is book 13 in our Traditional Mermaid Folk Stories Collection.