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This first volume does a delightful job of introducing the reader to the zany and colorful world of the Disc through the eyes of the inept failed wizard Rincewind and the world's first tourist, Twoflower.
Rincewind, who is much more comfortable running away from trouble than toward it, at first tries to avoid the flamboyant tourist from a strange land and his, umm, interesting luggage. That becomes impossible when Lord Vetinari, the Patrician of the, ahem, "grand" city of Ankh-Morpork charges the wizard with protecting the tourist. As fans of Pratchett know already, no one refuses Vetinari -- at least no one who survives more than a few more sentences.
That sets Rincewind on a path that will take him to the very edge of the disc and beyond, and also serves to introduce readers to a wide swath of the world that we all came to know and love.