We focus on the part of the internet that most people don't know about.

It's called the dark web.

Undercover in the furthest corners of the dark web,

US special agents are on a mission to locate and rescue children from abuse.

Move in now.

Police!

From the BBC World Service, World of Secrets, the darkest web follows their shocking investigations.

Listen on BBC.com or wherever you get to your BBC podcasts.

When a murder has remained unsolved for as many decades as the case of Vishal Marutra,

I've heard that there are only really three

ways it might ever be cracked. A new witness or confession, a forensic breakthrough, or a

coincidence. I can tell you right now that we don't have the first two. But a coincidence?

Well... that we don't have the first two. But a coincidence? Well, in 2019, something astonishing

happened. A man sitting in an office spot something in an old folder. Just one word. It could be nothing.

Or, after nearly 40 years of agony,

it could change everything.

I'm Suchin Marotra.

From BBC Studios, this is Vishal.

The true story of a boy who went missing, while the world looked the other way.

The story of his family. my family, and the story of the investigation into Vishal's

disappearance.

Chapter 4. The Coincidence

...