Where's My Cow?A Discworld picture book for people of all sizes

Every day, without fail, Sam Vimes must go home to read "Where's My Cow?", with all the right farmyard noises, to his little boy. He thinks of a useful book for him as he lives in a city. So he starts adapting the story. It is a story with streets, not fields. It is a book with rogues and villains and about the place where he'll grow up.