As 92-year-old Florence "Flo" Greene nears the end of her life, she writes a letter to Ruthie, the woman who grew up next door to her, describing the items Flo is leaving Ruthie in her will. But as it goes on, telling surprising stories about those “little” things Flo will leave behind, an unforgettable portrait of the life she has lived emerges. The letter starts off as an autobiography in things, but it turns out to do much more than that: ultimately, it will transform Flo and those around her. In the time she has left, Flo decides to take herself up on tiny dares. As these adventures lead her to make new friends, Flo helps them find the fulfillment that living a full life has led her to understand.