The Society Of S by Susan Hubbard

The novel follows the life of a young girl named Ariella Montero, who grows up isolated in a mysterious mansion with her enigmatic father. As she uncovers the secrets of her family's past, Ariella learns about her unique heritage and the existence of a hidden society. Her journey of self-discovery leads her to confront themes of identity, morality, and the nature of humanity, as she navigates a world filled with supernatural elements and complex relationships.