Mariana's investigation into how gold mining is funding terrorism gets interrupted by a military coup that strands the team in Niger.

Mariana investigates a nefarious scam that tricks elderly Americans into becoming unwitting drug mules.

Mariana investigates a nefarious scam that tricks elderly Americans into becoming unwitting drug mules.

Mariana tracks the illicit path of hashish from Morocco into Europe — a world of shadowy dealers, lightning-fast smuggling boats and endless wealth.

Mariana heads to Mexico to investigate the billion-dollar business of people smuggling to the US — a system fueled by cartels and corruption.

Mariana heads to the Congo to investigate the illegal trade in wild apes that have them on the brink of extinction.

The high cost of prescription drugs has pushed millions of Americans to the black market — and into hands of criminal syndicates looking to cash in.

The sale of human remains generates billions of dollars worldwide every year, but somehow remains largely hidden from the public eye.

Mariana heads to the Philippines to investigate a new blackmail scam where compromising photos are used to put pressure on victims.

Mariana tracks down an assassin in Los Angeles before heading to South Africa, where contract killings occur almost daily.