In the dusty boomtown of Presbyterian Church, Washington, in the year 1902, a charismatic individual named John McCabe makes his entrance, his enigmatic charm and audacious reputation preceding him like the ominous presence of a ghost. The town's lethargic residents, easily swayed by gossip, find themselves enveloped by McCabe's dominant aura as he constructs a thriving brothel and gambling hall, partnering with the British madam Constance Miller. As their businesses prosper, their romantic involvement deepens, albeit tinged with an essence of transactionality.
As the town flourishes, representatives from the Harrison Shaughnessy Mining Company in Bearpaw arrive, intent on purchasing McCabe's enterprises and the zinc mines nearby. However, McCabe staunchly declines their initial offer of $5,500, a choice that only incites the fury of the merciless agents. Constance warns him that his life hangs by a thread, as Harrison Shaughnessy has earned a fearsome reputation for dealing with those who refuse to yield.
In light of this threat, three hired guns—Butler, Breed, and Kid—enter town, their mission to eliminate McCabe hanging precariously over him like the sword of Damocles. Although feeling intimidated, McCabe contemplates selling but is mocked by Butler’s scornful assertion that he is nothing but a fraud who has never spilled blood. In pursuit of a peaceful resolution, McCabe travels to Bearpaw, searching for the elusive agents, only to find that they have mysteriously vanished.
Undaunted, McCabe consults with lawyer Clement Samuels, an aspiring politician who sees opportunity in adversity. Samuels bolsters McCabe’s courage, insisting that he must stand his ground against Harrison Shaughnessy, arguing that doing so could inspire others. Fueled by this newfound determination, McCabe prepares for a confrontation that could either lead to his redemption or his doom.
Upon his return, McCabe seeks solace within the chapel, but he is met by the pastor, who brandishes a shotgun with unwavering resolve. The confrontation concludes abruptly as Butler's bullet strikes down the pastor. Chaos erupts when a lantern shatters, igniting a fire that engulfs the chapel, prompting the townsfolk to rush in an attempt to extinguish the flames and salvage remnants of their community. Meanwhile, McCabe takes his own vengeance by ambushing Breed and Kid, leaving them lifeless in the snowy expanse. Yet, in a desperate struggle, the Kid manages to inflict a wounding blow on McCabe, ultimately leading to a fatal outcome for him as well.
As the townspeople work together to control the chapel fire, McCabe finds himself in the line of fire from Butler's hunting rifle, marking the end of his quest for revenge. In a last act of rebellion, he retrieves a derringer, and manages to take Butler's life before succumbing to his injuries. Though the townspeople rejoice at their triumph over the flames, McCabe lies dying alone in the frigid landscape, a stark contrast to the celebration echoing around him. Amidst this turmoil, Mrs. Miller remains lost in a haze within the opium den, her destiny forever linked to that of the fallen outlaw.
