Persephone Smith's husband was having an affair with her best friend. After discovering this, Persephone sought revenge. She wrote to her cousin in France, who sent her a poison powder. Persephone used the poison to spike pastries and wine, which she served to her husband and best friend. They both died shortly after ingesting the poison. To cover up the murders, Persephone set their bodies on fire, unintentionally starting the Great Fire of London that destroyed much of the city.