The Ball and the Cross by G. K. Chesterton

The Ball and the Cross is G. K. Chesterton's third novel. In the introduction Martin Gardner notes that it is a "mixture of fantasy, farce and theology." Gardner continues: "Evan MacIan is a tall, dark-haired, blue-eyed Scottish Highlander and a devout Roman Catholic.... James Turnbull is a short, red-haired, gray-eyed Scottish Lowlander and a devout but naive atheist.... The two meet when MacIan smashes the window of the street office where Turnbull publishes an atheist journal. This act of rage occurs when MacIan sees posted on the shop's window a sheet that blasphemes the Virgin Mary, presumably implying she was an adulteress who gave birth to an illegitimate Jesus. When MacIan challenges Turnbull to a duel to the death, Turnbull is overjoyed. For twenty years no one had paid the slightest attention to his Bible bashing. Now at last someone is taking him seriously! Most of the rest of the story is a series of comic events in which the two enemies wander about seeking a spot for their duel." MacIan and Turnbull become friends as they protect each other from interference from the modern world, which has trivialized their views over life's most important question (the existence of God) and outlawed their honorable duel. The irony is heightened when they both fall in love with ladies who happen to hold to their opponent's deepest convictions. Professor Lucifer and a Bulgarian monk also play important roles in this perennially relevant story.