I'd like to share a comment from an early reader of the new novel. An early reader, by the by, who is none other than S.J. Watson, author of the excellent Before I Go to Sleep:

“Plenty of books claim to be scary, but this is genuinely terrifying, don’t-read-late-at-night stuff. Thrilling, compelling, and beautifully written, The Demonologist makes Rosemary’s Baby feel like a walk in the park.”
—S.J. Watson, New York Times bestselling author of Before I Go to Sleep