Le film retrace les derniers jours de Guy Môquet et de ses proches camarades au camp de Choisel jusqu'à leur exécution en représailles après la mort de Karl Hotz le 22 octobre 1941.

Guy Môquet (26 April 1924 — 22 October 1941) was a young French Communist militant. During the German occupation of France during World War II, he was taken hostage by the Nazis and executed by firing squad in retaliation for attacks on Germans by the French Resistance. Môquet came down in history as one of the symbols of the French Resistance.