Vincent MacKenna, portrayed by Bill Murray, is a grizzled Vietnam War veteran residing in Sheepshead Bay, Brooklyn. As a son of Irish immigrants, Vincent’s life is filled with challenges; he grapples with alcoholism, gambling, and the emotional weight of his wife’s Alzheimer’s disease, which has left her unable to recognize him. Vincent dutifully does her laundry at the nursing home where she resides, often posing as a doctor to maintain appearances. The only other close connections in his life are a pregnant Russian prostitute named Daka, played by Naomi Watts, with whom he regularly has physical encounters, and his beloved cat, Felix.

The narrative takes an interesting turn when new neighbors, Maggie Bronstein, played by Melissa McCarthy, and her 12-year-old son Oliver, acted by Jaeden Lieberher, move in next door. Upon their arrival, Vincent’s already tattered Chrysler Lebaron suffers damage from a tree branch that falls when their moving truck hits it. Vincent, ever the opportunist, demands compensation from Maggie for the repair costs, escalating the situation further by deciding to sue the moving company, while asking Maggie to contribute for damage he previously inflicted on his own fence.

As Vincent navigates his daily struggles, including running out of money from his reverse mortgage and the mounting pressure from loan sharks like Zucko, he finds himself forced into an unexpected role of babysitter for Oliver as Maggie juggles a bitter divorce and her work as a radiology technician. Although initially reluctant, Vincent realizes he can charge Maggie for watching Oliver and sets a rate of $12 per hour, later modifying it to $11 if snacks are provided. Their relationship evolves, allowing for some amusing and absurd experiences, including visits to racetracks that form the backbone of Vincent’s lifestyle.

Through these interactions, we witness Oliver, who is bullied at school and struggles with the weight of being a good student, begin to look up to Vincent. Their unique friendship leads to Vincent teaching Oliver how to defend himself, which culminates in a significant moment when Oliver stands up to his bully and ultimately breaks his nose. With Oliver’s encouragement and his own newfound luck at the racetracks, Vincent manages to pay off some of his debts, even to the point of opening a savings account for Oliver with their winnings from betting.

However, Vincent’s luck takes a turn for the worse as he finds himself deeply in debt and ultimately steals money from Oliver’s savings account to make one last gamble. This gamble leads to disastrous consequences, including a stroke that lands him in the hospital. While recovering, he faces crushing news: the death of his wife, Sandy, whose belongings and ashes he must now confront. Simultaneously, Maggie faces legal challenges from her ex-husband, who seeks to limit her custody over Oliver due to Vincent’s perceived negative influence.

In a touching turn of events, Oliver nominates Vincent for a “Saints Among Us” school project, claiming him as “St. Vincent of Sheepshead Bay,” presenting him with a medal based on his dedication and sacrifices — both as a husband and as a soldier who saved fellow comrades during the war. The school community is moved by Oliver’s speech, igniting a sense of dignity and recognition for Vincent, which he had not sought but desperately needed.

In the final moments of the story, the bonds of friendship solidify as Daka gives birth to a daughter, bringing together Maggie, Oliver, and even Robert in a heartwarming gathering at Vincent’s home, reinforcing the idea of family built through chosen connections rather than merely blood ties. This narrative weaves a rich tapestry of redemption, companionship, and the complexities of human relationships, painting an enriching portrait of a man battling through his own maze of mistakes and misfortunes, finally finding meaning in life through friendships formed in life’s most unexpected ways.