A talking cat, intelligent rats, and a strange boy cooperate in a Pied Piper scam until they try to con the wrong town and are confronted by a deadly evil rat king.

Tiffany Aching, a young witch-in-training, learns about magic and responsibility as she battles a disembodied monster with the assistance of the six-inch-high Wee Free Men and Mistress Weatherwax, the greatest witch in the world.