The Last Continent

Although just about readable if you're short of occupation, this is a remarkably tedious book by Pratchett's standards, mostly about Rincewind, the wizards, and the Discworld's version of Australia. I don't dislike Rincewind, but he's inherently rather dull, and his habit of fleeing from one predicament to another tends to lead to aimless, plotless stories that Pratchett seems to make up as he goes along.