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John "Knox" Knox is a meticulous contract killer in Los Angeles whose life is upended when he is diagnosed with a rare, rapidly advancing form of fast-onset dementia. Realizing his mental faculties are deteriorating, Knox decides to quietly retire from his lethal profession. However, his final job goes catastrophically awry. Sent to eliminate a target alongside his volatile longtime partner, Tommy, Knox suffers a severe cognitive lapse in the heat of the moment. Disoriented and confused, he accidentally kills Tommy instead of the target, and then eliminates the remaining witnesses in a frantic haze before fleeing the crime scene.Desperate to tie up loose ends before his memory completely vanishes, Knox tries to navigate his final days while evading the relentless Detective Emily Ray, who is investigating the botched double homicide. Simultaneously, Knox is forced to reconnect with his estranged adult son, Miles, who unexpectedly shows up at his doorstep battered and desperate for help after killing a man who impregnated his teenage daughter. Realizing this is his final chance at redemption, Knox devises an elaborate, high-stakes plan to take the blame for his son’s crime, thereby protecting Miles from a lifetime in prison while simultaneously framing the original targets of his botched hit for Tommy’s murder.Knox uses his fading lucidity and decades of underworld expertise to orchestrate the complex cover-up, meticulously planting evidence that leads the police in the exact direction he desires. As his mind slips further away—relying heavily on written notes and voice memos to stay oriented—Knox ensures that his finances are secretly transferred to Miles and his ex-wife, Ruby. Detective Ray closes in, suspecting Knox’s involvement in the web of violence, but struggles to piece together the truth due to the airtight alibis Knox has constructed.Ultimately, Knox completes his final mission of parental sacrifice. The police close the case on the murders, believing the criminals Knox targeted killed one another, while Miles is left completely in the clear. In the film’s poignant conclusion, Knox sits in a quiet room, his mind finally succumbing to the encroaching darkness of his illness, completely at peace knowing he managed to save his son and secure his legacy before his memories faded into nothingness.