São Paulo stands as the world's fourth-largest city, home to more than 10 million people, and this film uses it as a case study for what happens when urban growth outruns infrastructure. Cameras move through the city's favelas, where residents describe living without reliable sanitation, clean water, or secure housing, while officials and urban planners weigh in on the strain that rapid migration puts on transit, housing, and public services. The film sets São Paulo's problems against the broader trend it opens with: projections that by 2030 most of the world's population will live in cities, making São Paulo's struggles a preview of pressures other metropolises will soon face. Interviews with slum dwellers sit alongside footage of the city's wealthier districts, drawing a stark line between the two Brazils that share the same skyline. The film treats inequality not as an abstraction but as a matter of plumbing, commute times, and who gets left off the map when a city grows too fast to plan for everyone in it.