The Visit

When Nix, a human/mermaid half-breed gets an unexpected visit from a wizard named Dumbledore who has an acceptance letter for her, her whole life gets turned upside down. She must adapt to human life so she can go through school to protect her family from the evil, but when she meets the Weasley twins, she begins to question whether or not she wants to go back to her family or begin a life on land.