France, 1942, during the occupation. Philippe Gerbier, in his civil life an engineer, is one of the French Resistance's leaders. Betrayed by one of his men he was captured by the Germans and interned in a camp. He manages to escape from the Gestapo-headquaters and joins his network at Marseilles. There he and his gang capture a traitor and throttle him. They then try to rescue a Resistance fighter in Lyons. As they do so, the Gerbbier is captured once more and his partner killed. Again he escapes just before he is executed. He then finds that a female partner has been captured. To avoid being forced into prostitution, the woman has informed upon the others. She is then released and subsequently killed by another Resistance fighter for revenge.