Some night-time prowler is turning the citizens of Ankh-Morpork, greatest city of the fantasy Discworld*, into something resembling small charcoal biscuits. And that's a real problem for Captain Vimes of the City Watch, who must tramp the mean streets of the city searching for a seventy-foot-long fire-breathing dragon which, he believes, can help him with their enquiries. In a city thrown into ...