Christopher Boone is fifteen years old and lives with his father at 36 Randolph Street in Swinton, England. He has a brown and white pet rat named Toby. His mother died of a heart attack two years ago, though he suspects that it was probably an aneurysm or embolism. He hates the colors yellow and brown, but loves red and the color of metal. He does not like most fictional books because they lie, but he does like Sherlock Holmes murder mysteries. He likes stars, but does not like crowds or loud noises. He wants to be an astronaut when he grows up, even though he knows that it is not likely to happen. He loves math and the natural order of the world. He likes dogs.