In 1873 Tucson, Arizona, a stagecoach brings together a diverse group of travelers: Maj. John Southern Don Wilbanks, Dr. Ann Thompson Jody Lawrance, and Indian agent Hiram Best Del Moore, along with gambler Dade Coleman Martin Landau and Loi Yan Wu Judy Dan, who is bound for San Francisco to work as a librarian. A sixth passenger joins at a food stop—the gunslinger Jess Dollard Warren Stevens—and the group continues their journey.
Soon after, Loi Yan Wu falls ill. Ann diagnoses chicken pox, but the driver and guard fear smallpox and decide to abandon the passengers. They pull the stage into the desert, claim they’re resting the horses, and slip away while most passengers are outside. Best stays in the coach, and the remaining five travelers press on on foot: Maj. John Southern carries the sick Loi Yan Wu as they trudge into the harsh landscape, hungry and thirsty but determined to survive.
They manage to scrounge water and food from hardy desert plants, moving toward a distant stagecoach they glimpse ahead. What they find is a grim scene: the driver and guard have been killed by Apaches, and the attackers have seized the horses and the men’s guns. The survivors bury the dead and make camp, wary of every sudden sound in the empty, sun-baked plain.
Tensions flare as scarcity drives hard choices. Coleman hoards a canteen of water that Dollard notices, and he takes it to share with the others only when it suits him. That night, Coleman slips away with Dollard’s gun and a knife Dollard had given Ann. When Southern makes a move to confront him, Coleman kills Southern and wounds Dollard, then drags Ann beneath the stage and forces her into submission, ultimately raping her.
Dollard is left for dead or dieling to recover, and Loi Yan Wu tends to his wounds while Ann endures as Coleman’s unpaid servant. As the days wear on, Coleman’s grip tightens, and he sends Dollard and Loi Yan Wu farther into the desert, ordering them to walk away and wait for his weakening. Loi Yan Wu quietly reveals to Dollard that Coleman now carries the chicken pox, a detail that could end his cruelty—if they can outlast him.
Just when it seems they might be abandoned forever, a stagecoach appears on the horizon. Coleman understands that if he and Ann are rescued, she could testify against him, so he fires at Ann and runs toward the approaching coach with the others in sight. But the new stage is attacked by Apaches, and all aboard are killed except for the wounded, delirious driver. The driver spots Coleman in the road and, misreading him as an attacking Indian, fires a fatal shot.
In the end, Loi Yan Wu and Jess Dollard escape with the stage’s horses, setting out together toward San Francisco to start a life away from the perilous frontier. The desert has claimed many lives, but a stubborn will to endure—and a stubborn hope for a new beginning—drives the survivors forward.
