The author of the bestselling The Third Man Factor examines the shockingly common phenomenon of the "Angel Effect": when people feel visited by an otherworldly presence in times of great danger or desperation. Do "angels" exist?I If so, are they heaven-sent or products of the human brain? After the publication of the bestseller The ThirdMan Factor, which examined the phenomenon of explorers who found themselves at the edge of death and experienced a benevolent presence that led them out of the impossible, John Geiger was inundated with firsthand accounts from people who had the same experience -- a vivid presence that aided them as they faced crises ranging from physical and sexual assaults to automobile accidents, airplane crashes, serious illness, childbirth, and depression. The Angel Effect examines this phenomenon, and Geiger argues that it has the potential to aid us, even to save us, and asks whether it is a trainable skill. He investigates the numerous experiences along with historical accounts and scientific research as he reveals compelling discoveries about the human brain and our innate capacity to hope.