Richard Sibthorp, youngest son of a celebrated Lincolnshire family, became through his forceful preaching and acknowledged piety, one of the leading Anglican Evangelicals of the 1820s. During the next decade, close study of the Old Testament turned him into a High Churchman who transformed his chapel on the Isle of Wight into a pioneering centre of ritualism. In 1841, at great personal cost, he converted to Rome. More astonishing was his announcement, in October 1843, that he was returning to the Establishment. Eighteen months as a priest had persuaded him the Protestant Reformers were right:...