Mariana embeds with pimps, victims, undercover cops and private investigators to understand illicit sex in America.

Mariana tackles the black market for tigers and tiger parts, that few have attempted to uncover its ugly details.

Mariana reveals the new bosses, new routes, new risks when American communities pay the price for fentanyl's next wave.

Mariana explores the vanity, insecurity and greed that's driving billion-dollar black market in body-enhancing drugs.

Mariana uncovers a supply chain of American firearms being smuggled into drug cartels, fueling gun violence in Mexico.

Mariana retraces one of the world's most intractable smuggling routes, following cocaine's path around the world.

Dives into international scamming to understand how it works and meet the outlaws at the heart of this booming industry.

Deep inside Peruvian underworld to meet the craftsmen who make and sell the world's finest counterfeit U.S. dollars.