This is the sort of story I dreamed of covering when I was a journalist. The sort of story for which the phrase You couldn't make it up was invented. The Adversary takes a deep, mesmerising dive into the darkness of a human soul. There were moments when I truly could not believe what I was reading. But unlike other serial killer noirs sitting on my shelves, this horror is real. And so much more chilling for that. Fiona Barton, author of The Widow sakriti opis