In a remote outpost on the edge of the Sahara Desert, rugged and experienced guide Joe January is hired by a pious and determined Paul Bonnard, who seeks to find a lost treasure based on his late father's journals. Paul is convinced that his father's writings will lead them to an ancient city filled with untold wealth. Along for the journey is Dita, a beautiful but troubled woman seeking escape and redemption. The trio ventures into the harsh and unforgiving desert, facing both the physical challenges of the environment and the psychological tensions among them.

As they progress deeper into the wilderness, each character’s personal motivations and pasts gradually come to light, causing friction and complicating their quest. Joe remains skeptical about the existence of the treasure while Dita's loyalty is tested by her growing affections towards both men. Struggling with thirst, fatigue, and the threat of marauders, they press on, driven by ambition and desperation. The expedition tests their resilience and reveals hidden strengths and weaknesses as they push towards their uncertain fate in the relentless desert.