In the year 2065, the world grapples with a dire scarcity of fresh water and habitable land, leading to overcrowded cities and abandoned rural areas. The rise of AI-driven human substitutes begins to take over regular human labor, creating a chasm between the old way of life and a new reality.
At the heart of this tale are two lovers, [Hen](saoirse-ronan) and [Junior](paul-mescal), who cling to the remnants of their life together on Junior's family's farm. The story unfolds with Hen lost in despair, sobbing uncontrollably in the shower—her anguish illuminated by a voiceover reflecting on her identity: >"I've lost those parts of who I am or who I could be, and I'm scared I won't ever get them back."
That very night, a mysterious figure named [Terrance](aaron-pierre) arrives, claiming to represent OuterMore, the corporation behind human colonies in space. He delivers shocking news: Junior has been shortlisted for a lottery to leave for this new world, but Hen has not been chosen. When Junior expresses doubt about leaving, Terrance ominously warns him about the implications of refusal, recalling the grim days of conscription, ultimately making it sound like an honor to be a hero for mankind.
After Terrance's visit, Hen and Junior's relationship faces strain. Hen retreats to the guest room, and as tensions rise, Junior reflects on their seven years of marriage, proclaiming he has always been happy. When they share intimate moments, there are flickers of hope, yet Hen's sadness continually lingers like a cloud overhead.
As time passes, Terrance resurfaces with the announcement that Junior is set to leave in a mere two weeks. This time, he will stay at their home to monitor Junior's progress, leading to a crash of emotions as Hen and Junior realize the proximity of their impending separation.
Living under the same roof, Terrance conducts a series of tests on Junior, while Hen grapples with unsettling feelings of isolation and jealousy. One fateful night, an unexpected fire ignites nearby, and as Hen stands entranced, Junior races towards it, sensing danger. Upon awakening bandaged and frail, he learns from Hen and Terrance that the fire was caused by someone else’s reckless actions, yet Junior feels an ominous threat to their safety.
Terrance's presence becomes more invasive, as he reveals that Junior will be replaced by a biological replica while he is away. The revelation devastates Junior, and his paranoia peaks when he encounters shadowy figures around their property, escalating to him brandishing a shotgun in a panic.
In a feverish exploration of their home, Junior uncovers a recording of Terrance interviewing Hen, wherein she reveals her fears about losing her identity. As the situation spirals, Junior faces hallucinations, believing that Terrance poses a direct threat to both his life and Hen's.
The story takes a sinister turn when Junior meets the real him—the one who had been shackled and monitored by Terrance. In an ironic twist, Hen seems to cope by creating a façade of normalcy, but beneath this surface, both she and Junior are irrevocably altered.
As their attempts to reconnect deepen, it becomes painfully evident that their past joy has morphed into a bitter shadow of their former selves. The resurgence of Junior's life coincides with the unsettling realization that Hen herself may have succumbed to the replica fate, leaving him to grapple with the haunting implications of love, loss, and identity in this dystopian reality.
Ultimately, as Hen gazes out the window of a plane preparing for take-off in the city across the valley, the audience is left pondering the profound cost of identity and the essence of genuine human connection in a world fraught with uncertainty.
