In the midst of the Great Depression, two families spend a holiday weekend together--but while their daughters cement their friendship, their parents tear their marriages apart.
Dozing in the backseat of her father's car, Mary Ann Hubbard is the happiest eight-year-old in the country. It's 1935, and she and her parents are going to spend Fourth of July weekend with her headmistress and the Zimmerns, whose daughter, Lolly, is Mary Ann's best friend from school. While the two little girls frolic in the attic, endowing the rambling old house with wonder, creativity, and imagination, their parents are downstairs, mired in all the pleasure, pain, and occasional childishness of adulthood.
As an affair threatens to tear the two families apart, Lolly and Mary Ann retreat further into playtime. By the end of the weekend, the girls will begin to realize that becoming an adult and growing up can be two very different things.