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I know, I know. I've rated a Discworld novel 2 stars. But for good reason. The characters are quirky as heck and the writing retains its lovely humor and depth. The plot, though, was nowhere to be found. I don't know what this book was about or why it was written, except for laughs. Laugh, I did. Luggage is its amazing and stubborn self. The bad guys are well done. Even the little boy who is the seventh son of a seventh son and a sorcerer was well-written and made you feel sorry for him while he was trying to take over the world.
But the story of Rincewind didn't advance at all. We don't see his character develop in any way. Nothing important that would give us a hint about the overall arc of life in Discworld happens.
Hence, two stars. Sad ones.