In this sobering and practical work, Fr. Gabriele Amorth offers clear teaching on the reality of Satan and the activity of fallen angels in light of Catholic doctrine. Drawing from his experience as an exorcist, he explains how spiritual evils arise, how they differ from ordinary temptation, and how the Church responds through prayer, sacramentals, and the rite of exorcism. With pastoral clarity, these pages equip readers to recognize the signs of spiritual attack, avoid superstition, and rely confidently on Christ’s authority and the protective power of the Church.