While dropping her kids off at summer camp, Claire receives a terrifying call—her 67-year-old mother Edith, who suffers from Alzheimer’s, has gone missing. Claire had left Edith in the care of her husband Nate while she was away, trusting him completely. But Nate calls in a panic: Edith wandered off during the night.

For three agonizing days, Claire and the police search desperately. When Edith is finally found and brought home, Claire feels relief—until her mother, in a rare moment of clarity, points at Nate and demands he be arrested.

Edith reveals she saw Nate with another woman in their bedroom while Claire was gone. Nate lied to her, telling her the woman was homeless and to leave the house, making Edith feel frightened and lost. Nate tries to brush it off as confusion from Edith’s Alzheimer’s, but Claire knows the truth.

Feeling betrayed, Claire confronts Nate, who admits to having a visitor but insists it meant nothing. Heartbroken, Claire realizes he used her mother’s vulnerability to hide his affair and failed to protect Edith, letting her wander for days. The police say there’s no evidence of a crime, but Claire ends her marriage then and there, telling Nate to leave. As Edith’s moment of lucidity fades, she comforts Claire, and together they prepare for the difficult road ahead.