During construction work in a small town in Thuringia, the burial of an unidentified man in an SS uniform with gunshot wounds is discovered. Taking into account that there were no military operations in this place and an ancient gold coin was found near the body, two police inspectors, Captain Stetter and Lieutenant Hoffmann, arrive to investigate the unusual incident. Soon they manage to get on the trail of a mysterious crime that took place twenty years ago, but it is cut short with the murder of the owner of the plot of land where the corpse was found. Realizing that the new crime is closely connected to the death of an unknown SS man, the police search for clues in the memories of old residents and archival documents.

This story of the miller Florian, who gave all his money to the war against Napoleon, is loosely based on a true story. After the war, Florian's reimbursement is challenged, and he must also pay taxes on his destroyed mill. He resists the tax collectors and takes off to Vienna, where he intends to defend his rights. On the way, he rescues the Duchess of Guastalla from assault. She also wants to go to Vienna, as His Majesty Franz II is trying to contest an heir in her favor. With cunning, luck, and dagger, Florian fights his way through a slew of nobility and their secret police.