In every town on Discworld, tales of rats and pipers are well-known. Maurice, a savvy alley cat, heads a group of intelligent rat companions (along with a not-so-bright kid) in a profitable scheme. The formula is simple: a piper and rats mean a significant payday. However, their plan hits a snag when they encounter someone with a different agenda. Now, Maurice and his rat crew are forced to confront a new idea: evil…