The Secret of Moonacre

When 13-year-old Maria's father dies, leaving her a homeless orphan, she has to leave London and move to Sir Benjamin, an eccentric uncle she has never heard of, in his mysterious estate "Moon Valley." Maria finds herself in a world divided by ancient enmity with the dark de Noir clan. She is the last Moon Princess and must overcome family pride and uncover the secrets of the past before the moon rises for the five-thousandth time and the Moon Valley is swallowed by the sea.