I just finished listening to
The Man Who Was Thursday by G.K. Chesterton. The ending left me feeling like I'd missed something. This was surely one of the strangest of his books that I've read. Thinking it was an espionage thriller, I assumed there would be less of the intrusion of the author's religious sentiments than in his Father Brown series, but found instead that it was filled not only with Christian allegory, but hints of oriental mysticism. (I learned after reading it that it was one of his earlier works, written while he was still a Protestant.)