While the medieval town of Pomme de Terre suffers from a plague of demons and a baron determined to keep his subjects in ignorance, a pair of unlikely heroes - an aquatic alchemist and his disgruntled apprentice - trek across the land to discover the source of demonic infestation and bring enlightenment to their land. Clark's first novel is a tongue-in-cheek fantasy that explores the lighter side of the Middle Ages and uncovers the "true" origins of indoor plumbing.

Traveling to Venice with the hopes of bringing some of the Englightenment back to his backward town of Pomme de Terre, Corwyn stumbles upon a terrible plot to sink the city of Venice into the sea.

Corwyn, the world's only aquatic alchemist, travels to Spain to do battle with sinister windmills and the scurrilous author who penned a scandalous biography of him.