When the Holy See gave general permission for Catholics to study again at Oxford and Cambridge, the stipulation was made that lectures be offered to provide support for their faith, as Catholics would be a minority in a rather hostile atmosphere. In the days when C. S. Lewis and J. R. R. Tolkien trod the greens of Oxford, those lectures were provided by the wise and witty Msgr. Ronald Knox, himself a convert to the Catholic Church. Erudite...