Returning to Discworld in "The Light Fantastic", Terry Pratchett drops the reader right into the action as well as Rincewind and Twoflower, though rather unceremoniously into an enchanted forest. The inept wizard and tourist head back to Ankh-Morpork in a roundabout fashion including a quick stop to talk with DEATH, while being chased by competent wizards, mercenaries, and religious fanatics sparked by the big red star the world turtle is heading towards.
The magic of Discworld is better understood as well as the society of wizardry. But the most outstanding part is the humor that Pratchett spreads throughout the book from the subtle to the outrageous. Given that the book was first printed almost 30, the humor still holds up as Pratchett twists tropes and situations that any fantasy reader knows. By the end of the book you just want to see what Pratchett will do next in Discworld.