Odourless, tasteless, colourless, lethal. In the mid-17th century, men were dropping like flies in Italy. And this wasn't just the plague - it was the work of the poison Aqua Tofana.

So what is Aqua Tofana? And who was its apocryphal purveyor, Giulia Tofana? In this episode we are diving back to Renaissance Italy to learn more about a circle of women poisoners, and the men they chose to murder. How did they eventually get caught? What is their legacy?

Kate is joined by Cathryn Kemp, author of historical novel, 'A Poisoner's Tale'.

This episode was edited by Tim Arstall and produced by Sophie Gee. The senior producer was Freddy Chick.

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