“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

“Richly crafted, deliriously scary and compulsively page-turning from beginning to end. Imagine The Exorcist and The Da Vinci Code as penned by Daphne du Maurier. Don't miss this one!”

– Jeffery Deaver, New York Times bestselling author of XO

“As compelling and smoothly chilling a tale as you’ll find this year. The Demonologist shows an enormously gifted writer at the top of his game, producing a novel of eerie menace and unique depth. Those of us who write supernatural stories do not throw the names Ira Levin, William Peter Blatty, and Peter Straub around lightly. You’ll be hearing all three associated with Mr. Pyper soon, and all such comparisons are warranted, the highest praise I can offer.”

– Michael Koryta, New York Times bestselling author of The Prophet

“Andrew Pyper’s satisfying prose propels a narrative sure to please readers with or without a dog-eared copy of Milton’s Paradise Lost on their shelves. If you’re looking for smart horror that chills without resorting to Grand Guignol, give The Demonologist a try.”

– Christopher Buehlman, author of Those Across the River

“Andrew Pyper is a rare breed. Reading The Demonologist is like running through a house on fire—you’ve got to get through; nothing will stop you. And when you’re out, brokenhearted and bewildered, you’re left wondering if what happened was real. That’s Pyper’s brilliance: he does it so well you never see the fiction. Contemporary and masterful, this is grown up horror for grown up people.”

– Sarah Langan, three-time Bram Stoker Award-winning author of Audrey's Door