The Discworld is, as everyone must now know, and no one should need to be told, flat. It rides through space on the back of four elephants* which, in turn, are standing on the shell of an enormous turtle. The Rincewind trilogy is a bumper volume containing the complete text of two novels and one novella, all starring one of the Discworld's most popular characters: the Wizzard Rincewind and his irrepressible - and quite intractable - Luggage. * There used to be five, but that's another story entirely