Maurice, an amazing cat who has survived four years on the toughest streets in the whole of the Discworld, reckons that rats are dumb - clever, okay, but dumb. Maurice, however, is smart, smart enough to recognize that there's a new kind of rat around: rats who have been eating wizards' rubbish and can now talk. Smart enough to get a pretty amazing idea when he spots a stupid-looking kid playing the flute....
Now Maurice has his very own "plague of rats" and his own Pied Piper. And his money-bags are getting fuller and fuller. Until the group reaches the far-flung village of Bad Blintz.