During the making of a video film about a communist printing press, a union member and a leftist activist discuss how to present their information, especially how to caption two specific images: one of a protest in Portugal, the other of a strike in France. One of them decides to write to his son, a manual worker living outside of Paris with his girlfriend, telling the young man about his troubles.

A strike at a French sausage factory contributes to the estrangement of a married filmmaker and his reporter wife.