Here is a quick read that is both mysterious and curious and it does not resolving every problem it presents. Anna's father wants to shelter and protect her so she lives a quiet life on an island. Along comes problems that interrupt this quiet life. Soon there is treachery and deceit and the discovery of a body washed up on the beach.
Wild Song by Jane Eagland is a short book and it does not have a clear ending. You might have to imagine on your own how a couple of issues play out. No sign of a sequel. There is another book by Eagland titled Wildthorn and although they share the word Wild they are not related except that they are both about the adventures of a young girl.
If you or someone you know has little time, read these small books.