The Light Fantastic (Discworld Series #2)

In this sequel to the much-acclaimed The Colour of Magic, Rincewind, Twoflower and the many-legged luggage return to the Discworld with the help of the Octavo and overcome the attempts by the wizards of the Unseen University to capture them, and then save the Discworld from an invasion from the Dungeon Dimensions.
‘Marvellous sequel... pure fantastic delight.' - Time Out