A group of rich young intellectuals hiding from the war in rural Italy play at being partisans when some disbanded soldiers and some refugees ask them for shelter in their villa. The young and aristocratic Andrea strikes up a friendship with a peasant girl, Lucia. Then the Germans suddenly appear, looking for the real partisans, and the time comes for serious decisions.

Florence, Italy, 1925, during the fascist dictatorship. In order to live near his girlfriend Bianca, young Mario moves to a humble street in the old city center, where he befriends Maciste and Ugo, two anti-fascists.

During the winter of 1944, the partisans stationed in the Ligurian Apennines must go to a factory in Genoa, in order to pick up a delivery of weapons. Meanwhile, there's a strike in the city and the Nazis are trying to suppress it violently. The factory becomes the scene of fighting between the Germans and the partisans but the latter, aided by the workers, will be able to get the better.