Set in the sprawling, rugged landscape of 1925 Montana, the story follows wealthy brothers and ranch co-owners Phil and George Burbank. Phil is a brilliant yet relentlessly cruel and domineering cowboy, deeply shaped by the tragic loss of his mentor, Bronco Henry. George, by contrast, is soft-spoken, fastidious, and emotionally restrained. Their uneasy dynamic is shattered when George impulsively marries Rose Gordon, a fragile widow who runs a local inn, and brings her and her sensitive, artistic son, Peter, to live at the sprawling family ranch.Phil immediately resents Rose, viewing her as an opportunistic intruder only after the Burbank
family fortune. Driven by bitter malice and toxic masculinity, Phil embarks on a psychological campaign of torment against Rose, mocking her lack of refinement and driving her back into severe alcoholism. Peter becomes the secondary target of Phil’s homophobic taunts, subjected to cruel ridicule from Phil and his rough-hewn ranch hands because of his delicate demeanor and interest in anatomy.Despite the initial hostility, a complex and shifting dynamic begins to form. Peter discovers a hidden shrine of pornographic magazines and photographs of Bronco Henry, realizing the hyper-masculine Phil harbors a deeply repressed, secret homosexuality. Sensing Peter's quiet observation rather than judgment, Phil’s demeanor toward the young man suddenly softens. Hoping to mold Peter into a tougher version of himself—or perhaps seeking a surrogate for the lost Bronco Henry—Phil takes Peter under his wing. He invites Peter on cattle drives, teaches him how to lasso, and even promises to craft him a braided leather lariat.Meanwhile, Rose spirals deeper into despair as Phil’s psychological grip tightens. Desperate to find peace, she makes a fateful decision: she trades the hides of several valuable cattle—which Phil had painstakingly collected for his special project with Peter—to local indigenous traders in exchange for whiskey.When Phil discovers his hides are gone, he is inconsolable and heartbroken, wandering out into the freezing wilderness in the middle of the night. Sensing his deep vulnerability, Peter approaches him with a
peace offering: the hide of a diseased steer that had died of anthrax, which Peter had carefully dissected earlier. Phil readily accepts the raw material for his unfinished lariat, unknowingly handling the deadly spores with his bare hands, which feature an open cut.Days later, Phil falls violently ill with anthrax poisoning and rapidly dies. At the subsequent funeral, as the family mourns, Peter watches from his bedroom window. He smiles faintly while holding the finished lariat behind his back, revealing that he systematically engineered Phil’s death to protect his fragile mother from further psychological destruction.