Global investigations from the BBC. Uncovering gripping stories from around the world and telling them episode by episode. Delve into a World of Secrets.

Latest season:

Somewhere in America, a twelve year old girl is being abused in her own home - photographs of it are being shared to a vast community of child abusers on the ‘dark web’ — an encrypted corner of the internet where users are untraceable. But, hidden amongst them, are two men whose job it is to try and find her: US Special Agents Greg Squire and Pete Manning. For over seven years, BBC Eye journalist Sam Piranty has been granted rare access to follow their work - observing the extraordinary lengths they will go to hunt down offenders and rescue children. Every detail matters, and every decision has consequences. They will not look away. The race is on.

Also, previously on World of Secrets:

The Child Cancer Scam: Millions of dollars are donated to help kids with cancer but families never see the money.

Death in Dubai: A woman falls from a tower block and her name starts trending. But behind the online rumours lies an even darker reality.

And the Abercrombie Guys: Investigating sexual exploitation claims against the former CEO of fashion giant Abercrombie & Fitch.