In 1994, a bright young college student in Beijing suddenly fell dangerously ill.

As her condition worsened and doctors scrambled for answers, no one could explain what was happening.

A blog post from her friends uncovered the truth.

She was being poisoned.

But the discovery raised more questions than answers, who was targeting her and why.

Today we're looking at the thallium poisoning of Zuling.

This is Red Web.

Welcome. Web. Welcome back Task Force to another episode of Red Web, the podcast all about unsolved mysteries, true crime, and the unknown. I am your resident mystery enthusiast, Trevor Collins,

and joining me hearing this mystery for the very first time.

Alfredo Diaz.

Unfortunate.

There are so many things you can use that have no taste or smell that you can poison someone with.

And there have been many cases in which people have done so.

And this seems like it might be one of them,

which is so unfortunate because it's always like,

I don't know,

like a close family member or spouse,

something like that.

You know what I mean? Because it's one of these things where the poisoning happens

little by little over time.

It adds up and it accumulates and it really damages your body. So it needs to be

someone that has constant access to you, which makes it usually a family member or a spouse. So

...