After his university graduation ceremony, David publicly and awkwardly proposes to his girlfriend, Nadja, and she happily accepts. A year and a half later, the pair are weighed down by work, school, and everyday stress, arguing in their Stockholm apartment. Nadja discovers she is pregnant and feels uncertain about becoming parents, so she tries to keep the news hidden from David. She turns to an older neighbor for reassurance, Tomas, who insists that parenthood is life’s greatest gift and hints at a personal loss of his own.
The next morning, David plans a spontaneous camping trip to see the northern lights, hoping to mend their rift. The couple, along with their dog Boris, set off and begin to rebuild their connection as they drive toward a remote inn. Along the way, David bumps into two rough-edged locals, brothers Jarmo and Rolle, whose truck bed is loaded with dead game, and the encounter leaves him uneasy. A minor accident at the gas station turns tense when their car is scratched, and Nadja’s irritation grows as she senses the brothers’ hostility. At the inn, the front desk clerk treats them with cold indifference, and Nadja’s unease deepens when she meets Einar, who offers them a place to stay at his cabin in the wilderness.
As the night unfolds, Nadja encounters more hostility—their car is vandalized with a racial epithet, and the pair feels increasingly exposed. Nadja, angered by what she sees, scratches the brothers’ pickup with a screwdriver, narrowly avoiding retaliation when Jarmo and Rolle reappear. The tension of the trip intensifies once they settle beneath the northern sky: Nadja reveals the pregnancy, and David grows anxious about the future they face together.
Suddenly a silent threat becomes visible: a red dot on the wall of their tent, initially mistaken for a prank but soon recognized as a rifle sight. A rifle-wielding assault appears imminent, and the couple flees as Boris bolts into the wilderness. The sounds of gunfire punctuate their desperate flight, and David is wounded in the shoulder as Nadja and their dog struggle to stay ahead. They survive a night in a makeshift shelter and return to the blood‑streaked campsite to find all their belongings gone and Boris’s severed head left behind, a stark warning of the danger closing in.
Injured and disoriented, David’s arm becomes more compromised as the pair press on through a brutal snowstorm. They stumble upon an emergency cabin and, after a tense moment of limbo, escape to find help, only to be confronted by an armed but unsuspecting Jarmo, who is determined to finish what he started. The chase pushes them into a bear’s den, and Nadja uses a flare to momentarily incapacitate him. David’s condition deteriorates, and he hallucinates the boy from his earlier vision, the spectral figure that haunts his guilt.
With the winter landscape closing in, Nadja spots Einar’s distant cabin and decides to press on for help, but she encounters Rolle along the way. David uses a rock to knock him unconscious, and the couple makes it to Einar’s door, where a grim, unsettling scene unfolds: the cabin is strewn with stealth photographs of the pair, and Einar’s demeanor hints at a hidden purpose.
Tomas arrives, revealing the horrifying truth that has festered beneath the surface since the engagement day: Nadja had attempted oral sex on David in the car when they drove home, a moment that distracted David long enough for a pedestrian—whom Nadja later realizes is the boy he had imagined in the woods—to be struck and killed. The drone Tomas used to capture their license plate had already set the stage for his revenge. He has watched them, waited, and now intends to push David toward an even darker act.
A chaotic struggle ensues as Tomas tries to coerce David into torturing Nadja’s child, and he shoots David in the knee when David resists. As Tomas moves to finish them both, the arrival of a furious Jarmo shatters the moment; Jarmo shoots and mortally wounds Tomas, who accidentally kills Einar in the process. Nadja and David seize the chance to escape, but their pursuer’s loyalties and the shifting danger complicate every decision.
In the end, Nadja retrieves the rifle from a stunned Rolle and returns to aid David, yet hesitation proves fatal: Mona, Tomas’s wife and Einar’s sister who had been encountered earlier at the inn, shoots Nadja in the head. Grief-stricken and broken, David pleads to be killed as well, but Tomas refuses, revealing that he can finally understand the raw pain that flooded him after his own son’s death. Mona and Tomas leave, and David is left alone in the snow, overwhelmed by loss, guilt, and the crushing weight of everything that has happened.
