The Fifth Elephant

Everyone knows that the world is flat, and supported on the backs of four elephants. But weren't there supposed to be five? Indeed there were. So where is it?...When duty calls. Commander Vimes of the Ankh-Morpork constabulary answers. Even when he doesn't want to. He's been "invited" to attend a royal function as both detective and diplomat. The one role he relishes; the other requires, well, ruby tights. Of course where cops (even those clad in tights) go, alas, crime follows. An attempted ass