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: The Child Cancer Scam. Your child is critically ill. It’s the worst news you can get. But to make the situation even more awful, you struggle to afford the care they need. So when someone tells you a foreign sponsor can help raise the money, you’ll do anything. You make a video: your child begs for help from strangers online. But it comes to nothing. You wait and wait for the cash that was donated. It never comes, and all the while your child is fighting for their life.

Previously on World of Secrets:

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.

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

And Al Fayed: Predator at Harrods. Women accuse Mohamed Al Fayed of rape.