Guards! Guards! - Terry Pratchett - Bog

Long believed extinct, a superb specimenof draco nobilis ("noble dragon") has appeared in Discworld's greatest city. Not only does this unwelcome visitor have a nasty habit of charbroiling everything in its path, in rather short order it is crowned King.Meanwhile, back at Unseen University, an ancient and long-forgotten volume?The Summoning Dragons?is missing from the Library's shelves. To the rescue come Captain Vimes, Constable Carrot, and the rest of the Night Watch who, along with other brave citizens, risk everything, including a good roasting, to dethrone the flying monarchand restore order to Ankh-Morpork(before it's burned to a crisp).