The Rats of Hamelin blends history and fantasy to reshape the hazy legend of the pied piper. After six years as a piper's apprentice, Hannes sets out on the mission that will make him a master in the guild. His orders seem simple enough: rid Hamelin of a plague of rats and use the reward money for a charitable cause. Simple indeed, until he discovers that the real rats of Hamelin aren't the ones scurrying underfoot.