Fifteen-year-old Christopher has a photographic memory. He understands maths. He understands science. What he cant understand are other human beings. When he finds his neighbours dog lying dead on the lawn, he decides to track down the killer and write a murder mystery about it. But what other mysteries will he end up uncovering? Paperback , 268 pages Published April 1st 2004 by Red Fox (first published July 31st 2003)