This episode of the National Geographic series follows heroin from poppy field to needle, tracing the money and the damage at every step. Cameras go inside the world of dealers moving product on American streets, users describing the pull of addiction in their own words, and law enforcement officers explaining how they try to intercept shipments before they reach a city's supply. The film lays out the economics plainly: how a plant grown thousands of miles away turns into a multibillion-dollar business that funds cartels and fuels violence in the neighborhoods where it's sold. Interviews with addicts are unflinching about the physical toll of withdrawal and the cycle that keeps pulling them back in, while dealers talk through the risk calculations of the trade. The series format keeps the focus tight and procedural rather than moralizing, letting the people actually inside the heroin economy, buyers, sellers, and cops, describe how it actually works.