Christopher John Francis Boone—it wouldn't be possible for him to introduce himself by anything less than his full name—knows "all the countries in the world and their capital cities and every prime number up to 7,057." He is going to take the difficult math exam for admission to a British university. He's going to get an A, he tells us, and he does. Asperger's syndrome, or high-functioning autism, would be an easy diagnosis, but neither term appears in the story. Haddon, and Christopher, are showing, not telling.