epression is the rule of the day in this film that skewers Greek governance of the 1960s. Z (Yves Montand), a leftist rabble rouser, is killed in what appears to be a traffic accident. But given the political climate, the death of such a prominent activist raises troubling questions. Though it's too late to save Z's life, a postmortem examination suggests that the ruling party was behind his death. As the facts leak out, those who tell the truth pay the price for their honesty.

Overview from themoviedb.org