Guards! Guards! (Discworld Series #8)

Welcome to Guards! Guards! , the eighth book in Terry Pratchett's legendary Discworld series. Long believed extinct, a superb specimen of draco nobilis ("noble dragon" for those who don't understand italics) 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 (it is a noble dragon, after all...). How did it get there?