The Amazing Maurice And His Educated Rodents
27: The Last Hero
29: Night Watch
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 . .