This film is a tribute to the men and women who, like Simon Wiesenthal, Serge and Beate Klarsfeld, devoted their lives to the hunt for former Nazis. Composed of archival documents, it opens with images of German civilians forced by the Allies to bury the dead of one of the last massacres of deportees in May 1945. Simon Wiesenthal tracked down Eichmann, the organizer of the Final Solution, until his arrest in South America. The Klarsfelds will meet Hagen, Lischka, Heinrichson, in charge of the Gestapo in Paris, as well as Barbie, the head of the Gestapo de Lyon. Beate Klarsfeld will publicly slap the German Chancellor Kiesinger, a former senior Nazi propaganda official. Finally, former French minister Maurice Papon will be tried for his participation in the deportation. As Mathieu Kassovitz says, touched by the film, he wanted to lend his voice to the film: "We can no longer say now that it didn't exist".