New York City, 1940s. In a crumbling tenement in Harlem, Lutie Johnson is determined to build a new life for herself and her eight-year-old boy, Bub - a life that she can be proud of. Having left her unreliable husband, Lutie believes that with hard work and resolve, she can begin again; she has faith in the American dream. But in her struggle to earn money and raise her son amid the violence, poverty and racial dissonance of her surroundings, Lutie is soon trapped: she is a woman alone, 'too good-looking to be decent', with predators at every turn.