Can someone summarize the demonologist by Andrew pyper?

"The Demonologist" by Andrew Pyper follows the story of David Ullman, a professor of demonology who is skeptical about the supernatural. When he is drawn into a terrifying series of events after his daughter is kidnapped, he is forced to confront the reality of demonic forces. As he delves deeper into the darkness, David grApples with his beliefs and the nature of evil, ultimately leading to a chilling confrontation that tests his courage and faith. The novel blends psychological Horror with existential themes, creating a gripping tale of parental love and the battle against malevolent forces.