October 1944, in the Republic of Salò, a German puppet state in the north of Italy and the last fascist stronghold in the country. After months of ferocious fighting on the Gothic Line, Colonel Martin Bora of the Wehrmacht must investigate the theft of a precious painting of Venus by Titian, stolen with uncanny ease from a local residence. While Bora's inquiry proceeds among many difficulties, the discovery of three dead bodies throws an even more sinister light on the scene.