The narrative builds to the geopolitical crisis of late 1942 in North Africa. Following the heroic stand of General Kœnig's forces at the Battle of Bir Hakeim, the United States and Britain launch Operation Torch in French North Africa. In a move that enrages De Gaulle, Allied leadership strikes a pragmatic deal with Vichy Admiral François Darlan (Mathieu Kassovitz), granting Darlan administrative control over North Africa to secure Vichy cooperation.
The climax shifts to Algiers, where 20-year-old resistance activist Fernand Bonnier de La Chapelle (Florian Lesieur) carries out the assassination of Admiral Darlan. Bonnier de La Chapelle is swiftly court-martialed and executed by firing squad, becoming a martyr. Darlan's sudden elimination shatters the Allies' Vichy compromise and leaves a power vacuum that allows De Gaulle to consolidate the resistance under one banner, setting the stage for Part 2 (Liberté / J'écris ton nom).