As Rincewind involuntarily becomes a guide to the naive tourist Twoflower, they find themselves forced to flee the city of Ankh-Morpork to escape a terrible fire, and begin on a journey across the Disc. Unknown to them, their journey and fate is being decided by the Gods playing a board game the whole time.

Moist von Lipwig is a con-man with a particular talent-- he is utterly unremarkable. When his execution is stayed in Terry Pratchett's remarkable Discworld, he must work off his debt to society as the land's head Postman. Things are not always as they seem, and soon Lipwig is delivering mail for his very life!