Set in the early 1960s during the Algerian War for Independence, a young British man named Simon Murray joins the French Foreign Legion to seek adventure and prove himself. The grueling training and harsh desert conditions push Simon to his limits, fostering camaraderie with fellow legionnaires, including the strong-willed Pascal Dupont. As Simon adapts to the brutal environment, he faces relentless physical and psychological challenges that test his resolve and change his perspective on courage and commitment.

As the fighting intensifies, so do Simon's internal conflicts, driven by the senseless violence and moral ambiguities of war. His relationship with Dupont becomes strained as loyalties are questioned and survival takes precedence. Torn between duty and disillusionment, Simon grapples with his purpose and the ideals that brought him to the war-torn landscape. His journey toward self-discovery is marked by pivotal moments that shape his understanding of honor, sacrifice, and redemption in a world ravaged by conflict.