Angels: God’s Secret Agents is Billy Graham’s one-volume introduction to one of the most popular spiritual phenomena of our time. Firmly grounded in Graham’s close readings of scripture, Angels testifies to Graham’s own encounters with the heavenly beings and also records the many similar stories that other believers have told him over the years. Graham devotes entire chapters to the questions of whether angels are visible or invisible, how they differ from men and women, and how the angelic hierarchy is organized. He also discusses the much-debated theory that UFO sightings are in fact angelic appearances.

Perhaps the primary purpose of this book, however, is to inform readers that armies of angels are ready and willing to help Christians in their daily fights against the forces of darkness. “Millions of angels are at God’s command and at our service,” Graham writes. “The hosts of heaven stand at attention as we make our way from earth to glory, and Satan’s BB guns are no match for God’s heavy artillery.” Such stirring theological pronouncements are matched with practical advice for believers who wish to know the angelic powers in everyday life.