At the Unseen University in Ankh-Morpork, magic leaks into all sorts of things, including the scraps from the wizards’ sumptuous dinners. Some of the rats who were helping themselves to leftovers got an unexpected dose of intelligence as part of the magic in the cooking. And a cat, Maurice, got it too when he ate some of the rats. Along with intelligence, they have acquired the ability to talk with humans. The rats mostly stayed rats, and the cat mostly stayed a cat, but not entirely. As The Amazing Maurice and His Educated Rodents opens, cat and rats have been a team for some time. The rats have abandoned Ankh-Morpork (well, these rats, at least) and are saving their money for an island far away with lots of food and no cats. Maurice has come up with a scam that meets their needs efficiently: the rats visibly infest a town, and Maurice conveniently furnishes a human piper to play a sweet tune and draw the rats out, just as soon as the town has coughed up a hefty fee. But recently they have had what Peaches, one of the rats, calls “a number of narrow squeaks.” Besides, some of the rats are starting to have ethical qualms about the scam. Further, the rats have plenty of money.
“The reason I say we’ve got more money, Maurice, is that you said what were called ‘gold coins’ were shiny like the moon and ‘silver coins’ were shiny like the sun, and you’d keep all the silver coins. In fact, Maurice, that’s the wrong way around. It’s the silver coins that are shiny like the moon.”
Maurice thought a rude word in cat language, which has a great many of them. What was the point of education, he thought, if people went on afterwards and used it? (pp. 19–20)
So the rats and the cat agree to run the scam one last time. The kid, who seems to have no discernible wishes beyond wanting opportunities to play his flute, agrees. The Uberwald town of Bad Blintz is their last show, and they are going to make it a big one. Little do they realize how big it will turn out to be.