Grace is an elderly widow living alone in New York City, yearning for a way to end her lonely existence. She meets Seymour, a hitman who is initially hired to kill her, but Grace convinces him to start a new business venture instead. Together, they devise a plan to offer assisted suicide to other elderly people who feel that their lives have become meaningless and burdensome. Grace is surprised at how many individuals are interested in their service, showing a community of seniors longing for a purposeful end.

As their operation begins to take shape, Seymour finds himself drawn into the lives of their clients, gaining deeper insights into their personal struggles. Grace, meanwhile, becomes an unexpected beacon of hope and comfort for these elderly individuals, despite the morbid nature of their enterprise. Their unconventional partnership starts to evolve, leading them into unexpected territories that challenge their initial intentions and force them to rethink the very nature of life and death.