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Mariana investigates underground fight clubs and the push to bring bare-knuckle fighting into the mainstream.

Trafficked With Mariana van Zeller

Mariana embeds with a crew of crypto scammers who show her how they make millions of dollars in mere weeks.

Violent crime soars in Los Angeles to levels not seen in 30 years; Mariana journeys into gangland to understand the violence plaguing the city.

Mariana goes on a mission to understand how personal and financial data is stolen and sold by a shadowy network of hackers and thieves.

Mariana explores the global surrogacy market to understand how the dream of starting a family is fueling a babies-for-cash black market.

Mariana investigates how the demand for MDMA in the U.S. is threatening to turn the Netherlands into a narco state.

Mariana embarks on a journey from Africa to the Middle East to investigate how black-market oil is fueling terrorist groups worldwide.

Mariana exposes the dangers of the growing and deadly ghost guns industry.

LSD is booming because of the growing faith in its healing power; Mariana hunts for the elusive chemists responsible for making the world's supply.

Mariana van Zeller investigates a dark and very elusive black market, the illicit trade in human organs.

Mariana van Zeller explores the complex inner-workings of the global underworld, black and informal markets.