In Nazi-occupied France during World War II, Philippe Gerbier, a stoic and steadfast leader of a French Resistance cell, is captured and imprisoned by the Vichy authorities. Escaping from a grim internment camp through both resourcefulness and sheer willpower, Gerbier reimmerses himself in the covert world of resistance activities. He reconnects with fellow underground fighters, such as the skilled and cynical Luc Jardie, along with Mathilde, a tactically brilliant yet warm-hearted woman deeply committed to their cause. Together, they engage in espionage, sabotage, and guerrilla warfare, often facing dire and morally ambiguous decisions to protect their network and confront their occupiers.

As the grip of their enemies tightens, trust becomes a rare commodity, and the line between friend and foe blurs. The Resistance members navigate a perilous landscape where betrayal can mean the difference between life and death. Each mission escalates in danger and importance, testing their loyalty, ingenuity, and resolve. The narrative exposes the harsh realities and sacrifices inherent in their struggle, painting a stark yet poignant picture of courage amidst oppression. From planning daring operations to dealing with the constant threat of betrayal, the Resistance fighters press on, driven by an unwavering dedication to liberating their homeland, even as the costs become increasingly personal.