Title: The Light Fantastic
Description: From the back cover:

In *The Light Fantastic* only one individual can save the world from a disastrous collision.  Unfortunately, the hero happens to be the singularly inept wizard Rincewind, who was last seen falling off the edge of the world....
Subjects: Fiction, Discworld (Imaginary place), Samuel Vimes (Fictitious character), Fantasy, Discworld (imaginary place), fiction, Fiction, fantasy, general, Fiction, humorous, Rincewind the wizard (fictitious character), fiction, Fiction, humorous, general, Literature and fiction, fantasy, Fiction, satire, English literature
Places: Discworld
People: Rincewind, Twoflower