Home From the Sea

They came from the sea.   For as long as she could remember, Mari Prothero had seen things-tiny manlike creatures that were mischievous and wore only seaweed, and beings that seemed to be made of water. Mari had grown up in a tiny Welsh fishing village where she lived alone with her father, Daffyd, a master fisherman-her mother and brother having drowned when she was a child.   On the morning of her eighteenth birthday, her father finally told her the great secret of the Prothero family.
Her family had an ancient covenant with magical shape-shifters, the Selch. Her lost mother and brother were not truly dead, but neither were they human. Now Mari must abide by her family's magical compact or face dire consequences.   But Mari is not without protectors. The tiny creatures she had seen her whole life counseled her to bargain with the Selch. While in faraway London, the head of the Elemental Masters had dispatched some very unique champions to come to Mari's aid....