Eight-year-old Flavia Mills Margaret O'Brien lives in a crowded New York tenement during the Great Depression, sharing a small space with her mother Helen Mills Phyllis Thaxter, her father Joe Mills Warner Anderson, and her aunt Susan Bratten Angela Lansbury, whose presence and patience offer a fragile balance to the family's daily struggles. Flavia is buoyed by the return of Steve Abbutt George Murphy, her aunt’s sweetheart, after a year away, a beacon of hope that temporarily brightens their cramped routine. But the air of optimism hides hard truths: Steve has a past that once pulled him into jail for his ties with a gangster, a burden that shadows every choice in the house.
One day Flavia, swept by a childish fable about turning a captured mouse into money, hides a tiny creature in a cigar box in the alley near Mac, the blind newspaper man Rhys Williams. Coincidentally, two neighborhood youths steal from him and stash the money near Flavia's box with the mouse; when Flavia discovers the hidden cash, her joy turns to fear as the adults around her accuse the girl of stealing from Blind Mac. The truth about the fable reveals itself, and the little girl grapples with the idea that many stories she has heard might be lies.
Meanwhile, money remains tight for everyone. Helen is pregnant and faces health risks, Joe struggles to find work, and Steve's old taxi job is gone again. A gangster presses him to steal a truck for a quick payday, presenting a moral fork that tests his conscience just before a crucial moment. Flavia’s quest to find a kneeling cow near a railroad — a strange, almost magical symbol from her world of stories — becomes a hopeful sign that things might shift before it’s too late. The tension in the tenement rises as the family clings to small mercies and big dreams alike. Desperation and resilience collide in their everyday choices, shaping the kind of future they dare to imagine.
By the end, Helen's health stabilizes, Joe lands another job, and the family gathers a new sense of possibility as Susan prepares to marry Steve, offering Flavia a promised future that feels almost like a reward for weathering the storm. The film moves through tenderness and hardship with a quiet, patient eye, asking what makes a life worth more than money and what kinds of truths — and lies — we choose to believe when the world feels stacked against us.
