‘A Tree Grows in Brooklyn’ is the sad story of the Nolan Clan, a brooklyn working-class family at the turn of the century. The show focuses on Johnny and Katie Nolan, and their turbulent courtship and marriage. Katie, blinded by love, stands by the charming but undependable Johnny through years of broken promises and tarnished hopes. Meanwhile, Katie's sister Cissy moves through a series of "common-law" husbands, each of which she insists on calling Harry after her first lover. The musical shows the heartbreaks that can be endured for the sake of a lover or child.