As the sun dips below the horizon in 1987, Calvin Barr, portrayed by Sam Elliott, finds himself reflecting on the twilight of his life, marked by an air of resignation and the weight of bygone days. His memories drift back to his earlier years as a World War II special ops soldier who undertook the daring mission to eliminate Adolf Hitler. Yet, the classified nature of the operation has left him with an emptiness that feeds into his current melancholic existence. Despite his valiant efforts, Barr feels a profound disappointment at the lack of recognition and impact his audacious act has had over the years.
In the present, Barr passes his time visiting his brother Ed, played by Larry Miller, at a quaint barbershop. Their conversations, filled with light banter and camaraderie, provide him with a semblance of comfort. However, this peaceful routine is abruptly shattered when a group of thugs pursues him for his vehicle, and he also finds himself under the constant surveillance of enigmatic government agents. These agents, representing a joint mission between the U.S. and Canada, reveal a dire threat looming over the world: a mysterious virus that could potentially extinguish all life on Earth. They believe that Barr, due to his rare immunity and exceptional skills, is their only hope to track down the source of this catastrophe: Bigfoot.
Equipped with his faithful dog, Barr embarks on an arduous expedition into the unforgiving wilderness. In their initial encounter, he succeeds in wounding the elusive creature, but it is only after much perseverance that he manages to corner the ailing Bigfoot. Caught in a moral dilemma, Barr feels a pang of sympathy for the creature's suffering and opts to cremate it rather than surrender it to the authorities, unaware that this act of mercy holds dire consequences for him.
As Barr lies wounded and on the verge of death, the scene transitions to a somber funeral where Ed delivers a heartfelt eulogy. Time flows on, and Ed, while fishing with Barr's devoted canine companion, remains blissfully unaware that Barr has survived his ordeal in secret. Eventually, Barr reappears to reunite with his brother on the river, their connection deepened through shared trials.
Finally at peace for having thwarted the looming threat and having made peace with his past, Barr is able to confront the ghosts that have haunted him for so long. In an emotional turn, he unearths his own coffin to retrieve a mysterious box, its contents hidden away along with his previous life as he walks off into the sunset, his spirit finally at rest.
