Set in New Orleans in the 1930s, Sonny and his mother are scraping by to pay their rent. Mama works in a fish canning factory, and Sonny works for the coal man before school each morning. When Mama loses her job, they no longer have enough money for the rent and fear that the landlord will turn them out. One day Sonny meets Smilin' Jack, a jazz musician who is playing his trumpet in Jackson Square. Smilin' Jack offers to play at a party at Sonny's house to help raise money for the rent. The neighbors all come to sing and dance and before they leave, drop some coins in a bucket. Sonny learns how people can help one another "if they put their minds and hearts to it."