Book excerpt: How do you fight an enemy you can’t see? In this field guide to defense against the demonic, Adam Blai, an expert in religious demonology and exorcism for the diocese of Pittsburgh, shares information and advice gained over years of extensive experience with the paranormal. Review the scriptural evidence about demons—who were cast down to earth, not hell—and the tricks they play to try to gain influence in our lives. You’ll also discover the tools the Church has developed for us to combat and resist the forces of evil. Written in an easy-to-read style, this book is perfect for the Catholic looking to learn more about the invisible forces hell-bent on the destruction of your soul—and how to claim the victory Christ has already won.