The amazing maurice and his educated rodents : Discworld Series, Book 28

Af Terry Pratchett (2008)
Summary: IT'S A RAT-EAT-RAT WORLD . . . Every town on Discworld knows the stories about rats and pipers, and Maurice - a streetwise tomcat - leads a band of educated ratty friends (and a stupid kid) on a nice little earner. Piper plus rats equals lots and lots of money. Until they run across someone playing a different tune. Now he and his rats must learn a new concept: evil . .
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Serie: 
Summary: IT'S A RAT-EAT-RAT WORLD . . . Every town on Discworld knows the stories about rats and pipers, and Maurice - a streetwise tomcat - leads a band of educated ratty friends (and a stupid kid) on a nice little earner. Piper plus rats equals lots and lots of money. Until they run across someone playing a different tune. Now he and his rats must learn a new concept: evil . .