Iris is engulfed in grief after the tragic loss of her young son, Mateo, who died during a family hiking expedition. In her desolation, she visits the very spot where her son tragically lost his life, standing at the edge of a cliff, contemplating the unthinkable act of jumping into the abyss below. However, just as despair threatens to take hold, she encounters a man named Richard. Their conversation, though brief, seems to create a glimmer of hope for Iris, encouraging her to step back from the ledge and follow him to where their cars are parked.
Yet, the situation quickly turns sinister when Richard reveals his true intentions; he viciously attacks Iris using a stun device, binding her wrists and ankles with zip ties, and tossing her into the back of his vehicle. Upon regaining consciousness, Iris finds herself in a precarious situation as Richard drives them to a remote cabin, indicating that they will spend "all weekend" together in his captivity.
Utilizing her wits, Iris cleverly employs a pocket knife to free her wrists, launching an attack on Richard. Their ensuing skirmish leads to a violent crash, but Iris manages to escape the wrecked car and begin severing the ties that bind her ankles. Just when she thinks she can flee to safety, Richard emerges with a syringe, revealing that he has injected her with a paralyzing agent that will gradually incapacitate her over the next twenty minutes.
Iris, driven by sheer determination, bolts into the woods, with Richard trailing her at a leisurely pace, fully aware that the drug will soon take effect. Desperate and struggling, she makes her way to a river, opting to float downstream in hopes of finding sanctuary. Eventually, she washes ashore on an isolated piece of land, where she is discovered by an elderly man named Bill, who is mowing his lawn. Through a clever method of eye communication—one blink for yes and two for no—Bill manages to understand Iris's plight.
As he prepares to call for help, the façade of safety shatters when Richard appears, introducing himself as "Andrew" and feigning concern for his "missing wife." Bill, however, is not fooled and resolutely avoids disclosing Iris's location. In a shocking turn of events, Richard attacks and kills Bill before setting his house ablaze, leaving Iris in a dire situation. Luckily, she begins to regain the mobility of her hands and, with sheer grit, she pulls on the blind cord as a subtle signal to Richard, who is oblivious to her recovery. He then carries her to his vehicle, driving away just as emergency responders arrive at the scene.
While en route, Richard receives a phone call from his daughter, who shares news of her excellent report card. Their conversation takes a turn as his wife informs him that they will be visiting the cabin that weekend. In a moment of panic, Richard comes to an agreement that complicates his malicious plans for Iris.
When they stop at a service station for fuel, Iris, now gradually reclaiming her strength, attempts to escape by trying to open the truck's door. Richard, needing to retrieve items from his destroyed car, gets sidetracked. At that moment, a police officer approaches, suspicious of the situation. Richard spins a deceptive tale of his wife’s reckless driving, but the officer instinctively probes deeper. In a shocking act of violence, Richard murders the officer before whisking Iris away to a secluded boat dock, where he plans to dispose of her like his past victims.
However, the tide begins to turn in Iris's favor when, in the boat, she manages to seize Richard's knife, stabbing him in the neck and pushing him into the water. As he struggles to reclaim the boat, Iris retrieves his gun and shoots him, causing the vessel to start sinking. Exhibiting remarkable resilience, she breaks free and swims to safety at the jetty.
Just as Richard drags himself onto the shore, clearly injured, Iris finds the strength to confront him one last time. Standing over him as he lies dying, she offers her thanks. Throughout her harrowing ordeal, she has not only fought for her life but has ultimately rediscovered her will to live—a poignant reminder of the resilience of the human spirit amidst overwhelming darkness.
