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Terry Pratchett: The Amazing Maurice and His Educated Rodents (Discworld, #28) (2001)

Winner of the 2001 Carnegie MedalOne rat, popping up here and there, squeaking loudly, and …

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This is a standalone novel, and one I think could very well be in a different series. The style is very different. It's still a full of humor (especially about cats), but its very dark and gritty compared to any of the other books.