The author, a well-known evangelical speaker and writer, examines the increasing claims of dramatic phenomena - called signs or wonders - associated with charismatic renewal, asking whether their origins lie in the Bible, mass hypnosis, demonic deception or genuine spiritual revival. In particular he looks at the influence of John Wimber and his Vineyard Christian Fellowship in California.;John White's previous books include Flirting with the World and Eros Defiled.