Who is the man in the black cloak in serafina?

In "Serafina and the Black Cloak" by Robert Beatty, the man in the black cloak is a mysterious antagonist who poses a significant threat to the protagonist, Serafina. He is connected to sinister events occurring in the Biltmore Estate, where Serafina resides. His character embodies the dark forces that Serafina must confront and overcome as she uncovers the truth behind his intentions and the danger he represents.