Drawing on Scripture, Church teaching, and his experience as an exorcist, Fr. Paolo Carlin offers sober guidance on recognizing authentic signs of diabolical influence and responding with prudence and faith. He explains the conditions that can open doors to spiritual harm, clarifies the distinction between psychological illness and possession, and outlines the spiritual weapons Christ has given His Church. With pastoral clarity, this book equips priests and laypeople alike to remain vigilant, seek proper help when needed, and stand firm in the protection of God’s grace.