I'm Mariana Spring, the BBC's social media investigations correspondent.

In my podcast, I've been investigating what happened to the daughter of a conspiracy theorist who died having rejected chemotherapy.

It would mean the world to me if I could make it that she wasn't just another in the long line of people that die in this way.

How does this reflect the rise of health conspiracy theories on social media and beyond?

The new series of Mariana in Conspiracy Land, listen on BBC Sounds.

BBC Sounds, music, radio, podcasts.

One overcast day in April 1919, a woman called Eglentine Jeb arrived at Trafalgar Square in London.

She had flaming red hair, which she pulled up into a bun at the back of her head.

She was tall, thin, pale she had, forget-me-not-blue eyes.

Trafalgar Square was a place where discontent often formed into protest.

It's where the Chartist demonstrated in 1848.

It's where the suffragettes would demonstrate.

Of course, the National Gallery is right there,

and that's where they slashed the Rokeby Venus in 1914.

Jeb was there with a purpose, too.

She handed out a leaflet to pass us by.

And it shows a photograph of a little child

with a massive head and a small body.

And she's actually being held, supported.

You can just see the hands of a nurse standing behind her,

lifting her because she cannot lift her own body weight.

The child had an intelligent face

...