'On my way to school I watch the cars going past the bus and remember their colours.
Three red cars in a row mean that it is going to be a Quite Good Day. Four red cars mean that it is going to be a Good Day. Five red cars mean that it is going to be a Super Good Day. And four yellow cars in a row mean that it is going to be a Black Day, which is a day when I don't speak to anyone and don't eat my lunch and Take No Risks, because yellow is the colour of custard and double yellow lines and Yellow Fever which is a deadly disease.'
Fifteen-year-old Christopher has a photographic memory. He understands maths. He understands science. What he can't understand are other human beings.
When he finds his neighbour's dog, Wellington, lying dead on a neighbour's lawn, he decides to track down the killer and write a murder mystery novel about it. In doing so, however, he uncovers other mysteries that threaten to bring his whole world crashing down around him.
This is an astonishing novel - funny, sad and utterly unputdownable.
