Although gifted with a superbly logical brain, for fifteen-year-old Christopher everyday interactions and admonishments have little meaning. He lives on patterns, rules, and a diagram kept in his pocket. Then one day, a neighbor's dog, Wellington, is killed and his carefully constructive universe is threatened. Christopher sets out to solve the murder in the style of his favourite (logical) detective, Sherlock Holmes. What follows makes for a novel that is funny, poignant and fascinating in its portrayal of a person whose curse and blessing are a mind that perceives the world entirely literally.?