Giulia Tofana was the whispered secret of desperate wives: a woman who bottled death and sold it as salvation. Her creation, the infamous Aqua Tofana, slipped into wine and soup without taste or trace, leaving doctors baffled and husbands quietly buried. In the candlelit streets of 17th‑century Italy, her name became a rumour, a warning, and a legend, proof that sometimes the most dangerous killer looks like a helpful friend.