There’s probably no more realistic and insightful account of the life of a saintly king. Saintly rulers are a great rarity: after St. Edward there’s St. Louis and – who? Duggan’s novel raises a question: Can a saintly man also be a good ruler? To run the worldly city well requires worldly – not merely heavenly – virtues. Hence his title, which shuffles the Gospel verse so that the innocent dove (Edward) is as cunning as the serpent.Well, in the wings, there's Blessed Karl of Austria.