Mariana investigates the illicit trade in human organs.
Mariana goes in search of the elusive chemists who make the world's LSD.
Mariana exposes the dangers of the growing and deadly ghost guns industry.
Mariana investigates how illicit oil is fueling terrorist groups worldwide.
Mariana explores how MDMA is turning the Netherlands into a narco state.
Mariana investigates the lucrative black market for private data.
Mariana journeys into gangland to understand the violence plaguing LA.
Mariana embeds with crypto scammers who show her how they make millions.
Mariana investigates the growing popularity of bare-knuckle fighting.
Mariana van Zeller investigates black-market plastic surgery.
Mariana meets the villains behind an exploding online romance scam.
Mariana explores California's booming weed black market four years after legalization.
Mariana van Zeller investigates outlaw motorcycle gangs known as 1% clubs.
Mariana exposes a racist underground movement bent on a violent future.
Mariana tracks a smuggling route of stolen cars from the U.S. to West Africa.
Mariana investigates a new breed of cocaine trafficker: lady bosses.
Mariana investigates the criminals destroying the Amazon rainforest.
Mariana explores the billion-dollar underworld of illegal fishing.
Mariana dives into the world of international scamming to understand how it all works.
Mariana investigates fentanyl, a contributor to the deadliest drug crisis in U.S. history.
Mariana meets the craftsmen who make and sell the world's finest counterfeit U.S. dollars.
Mariana van Zeller investigates a new wave of underground steroids promising to make users superhuman.
Mariana sets out to understand the ugly business of illicit sex in America.
Mariana retraces one of the world's most intractable smuggling routes, following cocaine's path around the world, from the Peruvian jungles to the Colombian coastline and to the streets of Miami.
Mariana tackles the secretive and dangerous black market for tigers and tiger parts.