 James Randi's "The Faith Healers" investigates Christian evangelists such as Peter Popoff, who claimed to heal sick people on stage in front of an audience.Popoff pretended to know private details about participants' lives by receiving radio transmissions from his wife who was off-stage and had gathered information from audience members prior to the show.According to this book, many of the leading modern evangelistic healers have engaged in deception and fraud.