The Amazing Maurice and his Educated Rodents (Discworld series Book 28)
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 . . .