But when a sinister arrival threatens both the animal and human residents of the estate, Serafina is the only one who can fight back. A dark, gray-bearded man in search of "the Black One" uses a pack of bloodthirsty wolfhounds to attack Serafina. Is he searching for the Black Cloak she destroyed? She only escapes with the help of a strange feral boy who seems to live in the forest.
When other animals at the estate begin lashing out, Serafina learns that a terrible power is taking hold of Biltmore and the surrounding forest. As she delves into the mystery of her past and searches for where she truly belongs, Serafina must find a way to defeat this new evil before it engulfs her beloved home.