Merewif: the Mermaid Witch

When Madge receives a moonstone necklace on her sixteenth birthday she discovers she is not only a mermaid but also a witch. Problem is she never knew either existed in the first place. As if wrapping her head around the fact that shes a mermaid-witch isnt enough it also turns out her parents were royalty to her kind and didnt die as shes been told her entire life. Instead they were murdered by her estranged aunt Viviane who is now after her. If Madge is to prove herself fit to lead her kind shell have to hone her newfound Vala and unravel clues from her mothers tome. But when Madge uncovers the dark power her murderous aunt wields will she have what it takes to save them all?