On December 12, 1969, a bomb kills 17 people at the Piazza Fontana national bank in Milan, Italy, marking the beginning of the Years of Lead. Local anarchists are scapegoated for the massacre by police and the media, but a lone prosecutor uncovers a conspiracy of far-right groups, corrupt secret services, and other interests that seek to undermine democracy.

A middle-aged writer is looking for a quiet retreat; a slightly younger female estate agent gives him details of a house a close to Venice.

Antonio, a policeman (carabiniere), has an order to take two children (Rosetta and her brother Luciano) from Milan to Sicily to an orphanage. Their mother has been arrested for forcing Rosetta (11 years old) to work as a prostitute. First the relation between Antonio and the children is tough, but it relaxes so they become temporary friends.