The colour of magic - Terry Pratchett

There was a time when no one knew about the Discworld, a huge disc supported by five elephants standing on the enormous giant turtle known as the Great A'tuin . . .

Rincewind was a perfectly ordinary failed wizard until he met Twoflower, the Discworld's very first tourist, and before he quite knew what had happened, he found himself employed, at an outrageous salary, as Twoflower's guide to this strange world. They started off in the Disc's oldest conurbation: proud Ankh and pestilent Morpork, the twin city known as Ankh-Morpork. Before too long the irrepressible Twoflower and Rincewind, who is both inept and cowardly, are forced to flee from the city. They meet up with an increasingly colourful cast of characters as they find themselves spending too much of their time being shot at, terrorised, chased, hanging from high places with no hope of salvation, or plunging from high places (likewise, with no hope of salvation) . . .

THE COLOUR OF MAGIC continues in THE LIGHT FANTASTIC, where an event is happening way overhead, far above the elephants and A'Tuin, where the very fabric of time and space is about to be put through the wringer.