Linda Chapman 
Not Quite a Mermaid: Mermaid Fire [EPUB ebook] 

From the author of the bestselling My Secret Unicorn books, comes a charming story about a girl who lives with mermaids. Perfect for readers of 6-8 years. Electra is a human mermaid – she has legs instead of a tail but, thanks to magic sea-powder, she can breathe underwater. Electra lives in the ocean, her best friend is a dolphin called Splash and her life is full of adventures. When Electra’s class learn to collect magic mermaid fire from the deep sea bed, Electra is keen to get more than everybody else. Elektra and Splash dive deeply, far away from the safety of the reef, where they not only find mermaid fire but danger too!