Katherine Boo spent three years getting to know the people of Annawadi, a slum of about 3,000 people on the edge of a sewage-filled lake in India’s largest city. Her book is a poignant reminder of how much more work needs to be done to address the inequities in the world. But it’s also an uplifting story of people striving to make a life for themselves, sacrificing for their families, and in their own way, being innovative and entrepreneurial in creating a vibrant local economy.