I like how conversationally the author remarks about what sources like St Augustine had to say about this or that event, and especially his asides about what he personally is skeptical about. One good example is a story about St Andrew finding St Matthew, tortured and blinded by unbelievers in Ethiopia. Andrew prayed and God restored the saint's gouged-out eyes and freed him from his tormentors. The author remarks that he finds it unlikely, because why should Andrew have had such an easy time doing what the great Evangelist could have done for himself?
I don't know that everyone would agree, but I find that kind of thing story of funny.