An Italian woman living in Rome during the 17th century sold black-market poison to women who wanted to escape their marriages. She packaged the liquid in glass vials and used labels that claimed it was a healing ointment. It was said to be slow-acting, tasteless, odorless, and completely undetectable. Warnings claimed just four to six drops were “sufficient enough to destroy a man.” But with the right dosage, aspiring widows could prolong their husband’s suffering — long enough for them to, say, get their affairs in order. Is Giulia Tofana history’s most prolific killer? Vanessa is joined by the hosts of the podcast Women & Crime, Doctors Meghan Sacks and Amy Shlosberg. Keep up with us on Instagram @serialkillerspodcast! Have a story to share? Email us at [email protected] Learn more about your ad choices. Visit podcastchoices.com/adchoices